Caffeine has little to no benefit after 3 nights of sleep restriction

A new study found that after restricting sleep to 5 hours per night, caffeine use no longer improved alertness or performance after three nights. Results show that relative to placebo, caffeine significantly improved Psychomotor Vigilance Task performance during the first two days, but not the last three days of sleep restriction.

Originally published at https://www.sciencedaily.com/releases/2016/06/160613130813.htm