The research: http://www.bmj.com/cgi/content/full/310/6979/565 http://www.bmj.com/cgi/content/full/310/6979/565 There is no such thing as a sleep debt in the s

The research: http://www.bmj.com/cgi/content/full/310/6979/565 http://www.bmj.com/cgi/content/full/310/6979/565 There is no such thing as a sleep debt in the sense that it accumulates over a week. You could go days without sleep and only need 8 hours to get back to perfect. However, in the course of a 24 hour period. If you only have 4 hours of sleep you obviously have a sleep debt of 3-4 hours and need to take a power nap or something