That's the thing is it doesn't usually come that easily.I usually crash about 3 or 4am and sleep a few hours and go for days like that with little sleep and even then it's artificially induced. Then after a week or so like that I crater out and sleep for 14 hours.But usually its a gradual process and I can feel myself getting sleepy. Then I go. Last night was like a sucker punch to the side of the head, BOOM! LIGHTS OUT!
