Comment by jorvi

> The scientist found that all the physical adverse effects of sleep deprivation were negated by the short power naps. Though IIRC the mental acuity did drop some as the event progressed.

I assume you mixed these up?

There's two well-known extreme sleep schedules (Uberman 6x20m or Dymaxion 4x30m) that let you subsist on two hours of sleep a day, because you drop into REM sleep immediately. This however only clears up "brain fog". If you would do exercise on these sleep schedules, you would make little progress because muscle repair happens outside of REM sleep.