To sleep or Not to sleep???

I have been awake since about 1am and it is now 4:30am, for various reasons but mostly because I just can't sleep. So now I am sitting here at 4:35am knowing that Ethan ate around 2:15am, and that I probably could get another hour or two of sleep in before he would wake up to eat. Is it worth laying in bed tossing and turning in the hopes of drifting off for a short time before I hear the grunts of little Ethan, or do I risk being completely sleep deprived and stay up?? Hmmm...