London 2012 Olympic Games Judo bronze medallist Rafael Silva of Brazil gets electrodes applied on his body at the Sleep Institute in Sao Paulo March 9, 2015. According to the Brazilian Confederation of Judo, Silva and others athletes of Brazil's national judo team are undergoing polysomnography tests to enable better sleep and performance for the upcoming Brazil 2016 Olympic Games. REUTERS/Paulo Whitaker (BRAZIL - Tags: HEALTH SPORT JUDO OLYMPICS)