Sleep

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.

Kim Kyung-Hoon/Reuters

A man takes a nap on a cushion, displayed as part of a promotional event, at a shopping mall in Beijing. Temperatures in the city on Friday reached 37 degrees centigrade

A man sleeps on the doorway of a closed shop at a market in Kolkata May 28, 2014.

Rupak De Chowdhuri/Reuters

A man sleeps on the doorway of a closed shop at a market in Kolkata Read more

Craig Short lays on chairs as he waits for a competition to begin at the World Clown Association's annual convention in Northbrook...Craig Short lays on chairs as he waits for a competition to begin at the World Clown Association's annual convention in Northbrook, Illinois, March 26, 2014. Hundreds of clown performers from around the world gathered at the event to attend seminars, performances, and competitions. Picture taken March 26, 2014.  REUTERS/Jim Young

Jim Young/Reuters

Craig Short lays on chairs as he waits for a competition to begin at the World Clown Association’s annual convention in Northbrook, Illinois. Hundreds of clown performers from around the world gathered at the event to attend seminars, performances, and competitions. Read more

A man sleeps on tetrapods as others stand on them on a beach along the Arabian Sea in Mumbai...A man sleeps on tetrapods as others stand on them on a beach along the Arabian Sea in Mumbai August 19, 2013. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY)

Danish Siddiqui/Reuters

A man sleeps on tetrapods as others stand around on a beach in Mumbai, India on Monday. Read more

A porter takes a nap under the shade of a tree on a hot day near a temple in Kathmandu June 12, 2013.

Navesh Chitrakar/Reuters

A porter takes a nap in the shade of a tree near a temple in Kathmandu, Nepal on Wednesday.