Why sleep
What research says. Each card opens its source.
7h+
7 hours or more
Sleep medicine societies recommend that adults sleep 7 or more hours a night on a regular basis.
Watson et al. 2015, Journal of Clinical Sleep Medicine 2 weeks Sleep debt adds upTwo weeks of 6 hours or less in bed a night hurt thinking as much as up to two sleepless nights, and people seemed largely unaware of it.
Van Dongen et al. 2003, Sleep 61,000 Regular beats longAmong about 61,000 UK adults, a regular sleep schedule predicted the risk of death better than how long people slept.
Windred et al. 2024, Sleep 0.05% Tired like tipsyAfter 17 to 19 hours awake, people did as badly or worse on some tests as at a 0.05% blood alcohol level.
Williamson and Feyer 2000, Occupational and Environmental Medicine