A labourer takes a nap in a basket at a wholesale vegetable market on a hot summer day in Kolkata, India, May 25, 2015. Temperature in Kolkata on Monday is expected to reach 37 degrees Celsius (98.6 degree Fahrenheit), according to India's metrological department website. REUTERS/Rupak De Chowdhuri

A reveller sleeps on the pavement during the Sanja Matsuri festival in the Asakusa district of Tokyo May 17, 2015. The Sanja Matsuri festival attracts over about one million visitors over its duration of three days, when parties of revellers carry portable shrines through the Asakusa neighbourhood, rocking and shaking them in a belief that this intensified the powers of the deities that reside inside them. REUTERS/Thomas Peter
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A man takes a nap during a rehearsal of the Minnesota Orchestra in Havana, May 15, 2015. The Minnesota Orchestra is in Cuba to perform at the National Theatre in Havana on May 15 and 16. REUTERS/Alexandre Meneghini TPX IMAGES OF THE DAY

Sikh twins sleep during the Baisakhi festival at Panja Sahib shrine in Hassan Abdel April 13, 2015. Hundreds of Indian Sikh pilgrims arrived into Pakistan to celebrate the Baisakhi festival with Pakistani Sikhs at the shrines of Panja Sahib and Nankana Sahib, the birth place of Sikh faith founder Guru Nanak Dev. REUTERS/Caren Firouz TPX IMAGES OF THE DAY

A model takes a nap backstage before the Hempel Award 23rd China International Young Fashion Designers Contest show at China Fashion Week in Beijing, March 25, 2015. REUTERS/Jason Lee

A labourer takes a nap in a wholesale fruit market area in Kolkata March 24, 2015. REUTERS/Rupak De Chowdhuri TPX IMAGES OF THE DAY

A man takes a nap at an antique shop in Beijing July 31, 2013. REUTERS/Kim Kyung-Hoon (CHINA)

A man takes a nap while fishing at Galata bridge in Istanbul February 13, 2015. REUTERS/Murad Sezer (TURKEY - Tags: SOCIETY)

A man takes a nap on a street in Beijing February 6, 2015.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: SOCIETY)

Indonesian labourers take a nap next to traditional wooden Phinisi cargo boats at Sunda Kelapa port in Jakarta February 3, 2015. Indonesia's economy in 2014 grew at its slowest pace in five years, as expected, the statistics bureau said on Thursday. Gross domestic product (GDP) expanded 5.02 percent in 2014 compared with 5.58 percent in 2013, using the statistics office's new 2010 base year. Picture taken February 3, 2015.
REUTERS/Darren Whiteside (INDONESIA - Tags: BUSINESS MARITIME)

A worker takes a nap during lunch break, at a Foxconn factory in the township of Longhua in Shenzhen, Guangdong province January 21, 2015. REUTERS/Tyrone Siu (CHINA - Tags: BUSINESS SCIENCE TECHNOLOGY INDUSTRIAL SOCIETY)

A grave digger sleeps near the graves of Ebola victims at a cemetery in Freetown, December 17, 2014.
The death toll in the Ebola epidemic has risen to 6,915 out of 18,603 cases as of Dec. 14, the World Health Organization (WHO) said on Wednesday. There are signs that the increase in incidence in Sierra Leone has slowed, although 327 new cases were confirmed there in the past week, including 125 in the capital Freetown, the WHO said in its latest update. REUTERS/Baz Ratner (SIERRA LEONE - Tags: DISASTER HEALTH TPX IMAGES OF THE DAY)

Delegates rest during a break of the plenary session at the U.N. Climate Change Conference COP 20 in Lima December 13, 2014. U.N. talks on slowing climate change were threatened with collapse on Saturday after China clashed with the United States and led emerging nations to reject a compromise outline of an agreement. REUTERS/Enrique Castro-Mendivil (PERU - Tags: ENVIRONMENT POLITICS)

A man rests in a hammock at a gasoline station in Siem Reap, November 23, 2014.
Picture taken November 23, 2014. REUTERS/Stefano Rellandini (CAMBODIA - Tags: BUSINESS SOCIETY ENERGY)

A woman sleeps at LaGuardia airport on the day before Thanksgiving in New York November 26, 2014. A storm expected to blast the East Coast with rain and snow through Thursday morning is threatening to snarl traffic for millions and impede air travel ahead of the Thanksgiving holiday. More than 800 flights into and around the United States were canceled on Wednesday, while more than 1,000 were delayed, according to tracking website FlightAware.com. REUTERS/Carlo Allegri (UNITED STATES - Tags: TRANSPORT SOCIETY TRAVEL)

A man takes a nap along a street next to his belongings as pedestrians walk past at Tokyo's Ginza shopping district November 16, 2014. Japan's economy unexpectedly shrank an annualised 1.6 percent in July-September after a severe contraction in the previous quarter, likely solidifying the view that premier Shinzo Abe will delay a second sales tax hike next year. Picture taken November 16, 2014. REUTERS/Yuya Shino (JAPAN - Tags: BUSINESS POLITICS TPX IMAGES OF THE DAY)

A man sleeps inside a train parked at the train station in Naypyitaw November 10, 2014. Yangon lost its status as Myanmar's capital in 2005, after the former military junta carved a new seat of government from a parched wilderness some 380 km (236 miles) to the north and called it Naypyitaw ("Abode of Kings"). This week, Naypyitaw will have its coming out party as world leaders, including United States President Barack Obama, Japanese Prime Minister Shinzo Abe and Chinese Prime Minister Li Keqiang, attend meetings organised around a summit of the Association of Southeast Asian Nations (ASEAN). Picture taken November 10, 2014. REUTERS/Damir Sagolj (MYANMAR - Tags: POLITICS TPX IMAGES OF THE DAY)

A worker take a nap as she waits for customers at the International Trade Centre mall in Jakarta, October 30, 2014. REUTERS/Beawiharta (INDONESIA - Tags: SOCIETY BUSINESS)

A street vendor rests near containers of diesel for sale in al-Halk district of Aleppo October 23, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT ENERGY)

A villager rests while harvesting olives in Anqoun town, south Lebanon October 19, 2014. REUTERS/Ali Hashisho (LEBANON - Tags: FOOD AGRICULTURE)

A man sleeps on a chair as others wait outside a hospital in Shanghai, September 1, 2014. As China tries to privatize an overburdened public healthcare system, private hospitals face a shortage ... of doctors. The bottleneck - the result of resistance from both public hospitals and doctors themselves - could dent a drive to reform China's hospital sector, just as investors flock to a healthcare delivery market that's set to more than double to $600 billion by the end of the decade, according to consultancy Bain & Co. Part of the problem is that doctors across most of China need permission from the state-owned hospitals where they practice before they can also work in the private sector. And many public hospitals don't want to let their best doctors go. Picture taken September 1, 2014. REUTERS/Aly Song (CHINA - Tags: BUSINESS POLITICS HEALTH SOCIETY)

A boy takes a nap inside a culvert used to prevent flooding, next to a pile of trash along a busy street in Tondo, Manila September 3, 2014. REUTERS/Erik De Castro (PHILIPPINES - Tags: SOCIETY)

A man takes a nap outside a bank branch as he asks for money on a hot summer afternoon in central Madrid September 1, 2014. REUTERS/Susana Vera (SPAIN - Tags: SOCIETY BUSINESS ENVIRONMENT)

A supporter of Imran Khan, the Chairman of the Pakistan Tehreek-e-Insaf (PTI) political party, takes a nap on chairs through a field littered with waste, during what has been dubbed a "freedom march" in Islamabad August 24, 2014. Khan and cleric Tahir ul-Qadri, who controls a network of Islamic schools and hospitals, have been leading protests in the capital, Islamabad, trying to bring down Prime Minister Nawaz Sharif. REUTERS/Akhtar Soomro (PAKISTAN - Tags: POLITICS CIVIL UNREST ENVIRONMENT)

Chinese artist Zhou Jie takes a nap on an unfinished iron wire bed, one of her sculpture works, after lunch at Beijing Now Art Gallery, in Beijing August 11, 2014. Zhou started her art project titled "36 Days" on August 9, in which she would live inside an exhibition hall with an unfinished iron wire bed, some iron wire sculptures in the shape of stuffed animal dolls, a certain amount of food and her mobile phone, for 36 days. The entire process is open to visitors and she may also interact with them, according to Zhou. REUTERS/Jason Lee (CHINA - Tags: SOCIETY)

Labourers take a break at the end of the work day against the backdrop of the financial district of Singapore August 6, 2014. Picture taken August 6, 2014. REUTERS/Edgar Su (SINGAPORE - Tags: BUSINESS EMPLOYMENT SOCIETY CITYSCAPE)

An Israeli soldier rests near the border with Gaza August 6, 2014. A Gaza truce was holding on Wednesday as Egyptian mediators pursued talks with Israeli and Palestinian representatives on an enduring end to a war that has devastated the Hamas Islamist- dominated enclave. Israel withdrew ground forces from the Gaza Strip on Tuesday morning and started a 72-hour Egyptian-brokered ceasefire with Hamas as a first step towards a long-term deal. REUTERS/Amir Cohen (ISRAEL - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY)

An Israeli soldier from the Nahal Brigade sleeps after returning to Israel from Gaza August 5, 2014. Israel pulled its ground forces out of the Gaza Strip on Tuesday and started a 72-hour ceasefire with Hamas mediated by Egypt as a first step towards negotiations on a more enduring end to the month-old war. REUTERS/Baz Ratner (ISRAEL - Tags: POLITICS CONFLICT CIVIL UNREST MILITARY TPX IMAGES OF THE DAY)

A businessman takes a mid-day nap in the lobby of a midtown hotel in the Manhattan borough of New York August 1, 2014. REUTERS/Carlo Allegri (UNITED STATES - Tags: SOCIETY BUSINESS)

Israeli soldiers sleep atop a tank outside the Gaza Strip July 27, 2014. A humanitarian truce in the Gaza Strip collapsed on Sunday after a barrage of rockets fired by Palestinian militants was met with fierce Israeli shelling, in a fresh setback to efforts to secure a permanent ceasefire. REUTERS/Ronen Zvulun (ISRAEL - Tags: MILITARY CONFLICT CIVIL UNREST POLITICS)

Migrant workers sleep under a mosquito net beneath an overpass in Mumbai July 24, 2014. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY TPX IMAGES OF THE DAY)

A man sleeps along the Canal Saint Martin during a hot summer day in Paris July 16, 2014. REUTERS/Charles Platiau (FRANCE - Tags: SOCIETY TRAVEL ENVIRONMENT TPX IMAGES OF THE DAY)

An Israeli army reservist rests in a field outside the central Gaza Strip July 16, 2014. Israel urged the evacuation on Wednesday of several Gaza Strip areas where more than 100,000 people live, threatening ground operations after briefly holding fire under an Egyptian truce proposal that failed to stop Palestinian rocket salvoes. REUTERS/Baz Ratner (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY)

An Israeli soldier brushes his teeth at a military staging area outside the northern Gaza Strip July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY)

A worker unloads sacks of vegetables as men sleep on top of a truck at a wholesale vegetable market in the western Indian city of Ahmedabad July 14, 2014. India's wholesale price inflation in June eased to a four-month low of 5.43 percent, helped by slower increases in food and fuel costs, government data showed on Monday. REUTERS/Amit Dave (INDIA - Tags: FOOD BUSINESS TPX IMAGES OF THE DAY)

A woman dozes next to her spice stand at the San Juan food market in Mexico City May 14, 2014. An ancient megalopolis built in a drained lake rimmed by mountains, Mexico City consistently flies under the radar. Despite lacking the samba-steeped allure of Rio de Janeiro or the chic intellectualism of Buenos Aires, Mexico City also feels like a city on the up, benefiting from more than a decade of progressive city administrations who cleaned up the atmosphere, legalized gay marriage, introduced a successful bike-sharing scheme and spruced up the austere historic center. From high-end molecular gastronomy to endless street stalls selling insect-stuffed quesadillas, you're never likely to go hungry in Mexico City. Picture taken May 14, 2014. REUTERS/Edgard Garrido (MEXICO - Tags: FOOD SOCIETY TRAVEL TPX IMAGES OF THE DAY)

Movers rest during their lunch break in the neighborhood of Santa Teresa in Rio de Janeiro June 24, 2014. In a project called " On The Sidelines " Reuters photographers share pictures showing their own quirky and creative view of the 2014 World Cup in Brazil. REUTERS/Kai Pfaffenbach (BRAZIL - Tags: SPORT SOCCER WORLD CUP SOCIETY)

A fruit vendor sleeps on a couch as she waits for customers in Yingjiang county, Yunnan province June 2, 2014. REUTERS/Wong Campion (CHINA - Tags: SOCIETY BUSINESS TPX IMAGES OF THE DAY)

A man takes a nap on a cushion which is displayed as a promotional event of a fashion brand at a shopping mall in Beijing May 30, 2014.
Temperatures in Beijing on Friday reached 37 degrees Celsius (98.6 Fahrenheit) since it hit a record high of around 40 degrees Celsius (104 Fahrenheit) yesterday, the highest since 1951. The Beijing heatwave is expected to continue through the weekend, local media reported. REUTERS/Kim Kyung-Hoon (CHINA - Tags: ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY)

A driver takes a nap inside his parked auto-rickshaw along the roadside in the old quarters of Delhi May 30, 2014. REUTERS/Anindito Mukherjee (INDIA - Tags: SOCIETY TRANSPORT TPX IMAGES OF THE DAY)

Twenty-one month old Adelson Gannod looks at a young male Sumatran tiger while visiting the new $19.5million Tiger Trail at the San Diego Zoo Safari Park in San Diego's San Pasqual Valley May 21, 2014. The soon to open exhibit will house six tigers and features waterfall feed ponds, rocks for climbing and tall crass for catnaps. REUTERS/Mike Blake (UNITED STATES - Tags: ANIMALS SOCIETY)

A young male Sumatran tiger sits in a new $19.5million Tiger Trail at the San Diego Zoo Safari Park in San Diego's San Pasqual Valley May 21, 2014. The soon to open exhibit will house six tigers and features waterfall feed ponds, rocks for climbing and tall crass for catnaps. REUTERS/Mike Blake (UNITED STATES - Tags: ANIMALS SOCIETY)

A young male Sumatran tiger hides in a new $19.5 million Tiger Trail at the San Diego Zoo Safari Park in San Diego's San Pasqual Valley May 21, 2014. The soon to open exhibit will house six tigers and features waterfall feed ponds, rocks for climbing and tall crass for catnaps. REUTERS/Mike Blake (UNITED STATES - Tags: ANIMALS SOCIETY)

A young male Sumatran tiger hides in a new $19.5 million Tiger Trail at the San Diego Zoo Safari Park in San Diego's San Pasqual Valley May 21, 2014. The soon to open exhibit will house six tigers and features waterfall feed ponds, rocks for climbing and tall crass for catnaps. REUTERS/Mike Blake (UNITED STATES - Tags: ANIMALS SOCIETY)

Lion keeper Janet Lawhow feeds a 10-year-old Sumatran tiger named Teddy in a new $19.5million Tiger Trail at the San Diego Zoo Safari Park in San Diego's San Pasqual Valley May 21, 2014. The soon to open exhibit will house six tigers and features waterfall feed ponds, rocks for climbing and tall crass for catnaps. REUTERS/Mike Blake (UNITED STATES - Tags: ANIMALS SOCIETY)

Twenty-one month old Adelson Gannod looks at a young male Sumatran tiger while visiting the new $19.5million Tiger Trail at the San Diego Zoo Safari Park in San Diego's San Pasqual Valley May 21, 2014. The soon to open exhibit will house six tigers and features waterfall feed ponds, rocks for climbing and tall crass for catnaps. REUTERS/Mike Blake (UNITED STATES - Tags: ANIMALS SOCIETY TPX IMAGES OF THE DAY)

A young male Sumatran tiger sits in a new $19.5million Tiger Trail at the San Diego Zoo Safari Park in San Diego's San Pasqual Valley May 21, 2014. The soon to open exhibit will house six tigers and features waterfall feed ponds, rocks for climbing and tall crass for catnaps. REUTERS/Mike Blake (UNITED STATES - Tags: ANIMALS SOCIETY)

Two young male Sumatran tigers play in a new $19.5 million Tiger Trail at the San Diego Zoo Safari Park in San Diego's San Pasqual Valley May 21, 2014. The soon to open exhibit will house six tigers and features waterfall feed ponds, rocks for climbing and tall crass for catnaps. REUTERS/Mike Blake (UNITED STATES - Tags: ANIMALS SOCIETY TPX IMAGES OF THE DAY)

People rest during a hot afternoon by the river Buriganga in Dhaka May 20, 2014. REUTERS/Andrew Biraj (BANGLADESH - Tags: SOCIETY ENVIRONMENT)

A man takes a nap at his shoe store at the Namdaemun Market in Seoul May 20, 2014. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: BUSINESS)

A couple takes a nap in front of a wall of the Forbidden City in Beijing May 16, 2014.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: SOCIETY)

A man takes a nap on a couch under an electronic board displaying share prices during trading session at the Karachi Stock Exchange April 2, 2014. Pakistan's main stock exchange closed higher on Wednesday, with the benchmark 100-share index of the Karachi Stock Exchange rising 1.33 percent, or 366.52 points to 27,932.02. REUTERS/Akhtar Soomro (PAKISTAN - Tags: BUSINESS)

A man sleeps outside a mall as people jog past in Singapore March 6, 2014. REUTERS/Edgar Su (SINGAPORE - Tags: SOCIETY SPORT)

A man sleeps on his cart next to carton boxes outside an electronics market near a street in Guangzhou, Guangdong province February 23, 2014. China is aiming for economic growth of between 7 and 8 percent, a level that is good for both the country and the world, Central Bank Governor Zhou Xiaochuan told a G20 meeting in Sydney this weekend. REUTERS/Alex Lee (CHINA - Tags: BUSINESS SOCIETY)

A couple sleep next to their bag as they wait for a train at Zhengzhou Railway Station in Zhengzhou, Henan province, February 19, 2014. REUTERS/Jason Lee (CHINA - Tags: SOCIETY TRANSPORT)

A worker stands next to a light stand as another worker sleeps after an overnight shift at a road construction site in Colombo, early morning January 4, 2014. REUTERS/Dinuka Liyanawatte (SRI LANKA - Tags: BUSINESS CONSTRUCTION SOCIETY EMPLOYMENT)

Passengers wait after their flights were delayed at LaGuardia Airport's Terminal A during a winter storm in New York January 3, 2014. A major snowstorm producing blizzard-like conditions hammered the northeastern United States on Friday, causing 2,000 U.S. flight delays and cancellations, paralyzing road travel, and closing schools and government offices. REUTERS/Zoran Milich (UNITED STATES - Tags: SOCIETY TRANSPORT ENVIRONMENT TPX IMAGES OF THE DAY)