Sleep like Batman

Yes he even has a certain way he sleeps.

Batman sleeping.

1. There's a certain way you sleep and most people don't realize this, it's called REM(Rapid Eye Movement) sleep. This way works as a process or sleep cycle every human goes through every session takes about 1 hour and 30 minutes. So you'd want to schedule you sleep time in 1 hour and 30 minute periods.

Ex. So let's say Batman just came back at 3a.m. from rescuing the city from Penguin or The Joker or whoever, what he'd do is fix himself up and everything(take a shower maybe) so that would be 30 minutes. He'd set his alarm for 11a.m.(7 hours and 30 minutes, 1 hour and 30 minutes times 5) and wake up and do what Batman(or Bruce Wayne) does.
2. Always get AT LEAST 6 HOURS of sleep anything less is unhealthy. Remember 1 hour and 30 minutes is how much time it takes for one process. Construct  a sleep pattern that includes at least 4 sessions(6 hours) everyday. Goodnight and good luck.