My sleeping time is not fixed but when ever i go to bed i'll sleep.
Oh goodness, it depends greatly on whether or not a new book has graced my e-reader. Unfortunately (or fortunately, depends on how you look at it), when I have a new book I'm obsessed with, I won't put it down until i'm done with it. Depending on the length, it would usually take me from 1 hour to 5 hours (I'm a fast reader). So if it's the latter, I usually get some shut eye at around 1-2 am. But if I'm just drained from the entire day, earliest is 10pm.