I wish I could stay asleep for 8 consecutive hours, or even go back to sleep after waking up at hour 6 without feeling like shit the rest of the day. Some of my most restorative sleeping has been 4 hours or a 30 minute nap. Sleeping more than 30 minutes and less than 4? Straight to sleepy jail. More than 4 hours, but a little less than six? Sleepy jail. More than 8 hours? Probably dead, definitely at least sleepy jail where nothing productive happens.