The short 'power nap'

The 10-minute nap lifted alertness, mood and thinking right away; the 30-minute nap left them impaired on waking.

Also called ~10-20 min

Who it's forAny man who naps on the weekend and wakes up worse than he lay down.

The item

Three squares: proven in human trials. Two: a strong signal. One: early human data. Striped: the trials disagree.

Emergency: call 911.

I am not a doctor. This is not medical advice. This is self-education. Talk to a physician who has your history before you change anything.