[jole]

I take power naps regularly almost every day, and it's true, after 15 mins of nap, I'm much more fresh and awake than before nap. I usually take nap after lunch, so between 13 - 15h.

About sleeping in general, I don't think that sleeping less than 8h per day is a myth. Nikola Tesla was sleeping 3-4 hours per day!

Recently I have found a cool website, which helps you to decide when to wake up or when to go to bed, so you can wake up fresh in the morning - sleepyti.me - bedtime calculator