i used to need 8-10 hours but after reading tim ferriss' 4 hour body i nap 20 minutes 2/3x a day at my desk and only need to sleep 4/5 a night which is saving me 4/5 hours a day of sleep time.. i don't feel fabulous when i wake up lol, but i feel the same as if i had slept more.. http://www.4hourlife.com/2012/04/29/become-uberman-sleep-lik... only problem is culturally workplaces aren't very accepting of polyphasic sleep patterns that involve napping in the office lol