The Perfect Nap: Sleeping Is a Mix of Art and Science – WSJ.com
Field Guide to the Perfect #Nap: 10′ for alertness, 60′ for memory, full-sleep-cycle 90′ for creativity http://on.wsj.com/17FIy9U MT @profpiro
Can a 10-minute nap do more good than snoozing for an hour? Field Guide to the Perfect Nap
http://online.wsj.com/article/SB10001424127887323932604579050990895301888.html