Get used to it...
G'day vbsydcc,
I'm an Eastern FO and almost all of our overnights involve a 5:00am wake up. It's very common for us to either:
Go to bed at 10:00pm (say) and lie awake in bed until around 2:00am;
or:
Got to sleep at 10:00pm and wake up at 2:00am and not get back to sleep.
Flight crew and Cabin crew alike.
The only crew immune to this are the ones who are parents of young children.
If I get 5 hours sleep or more on an overnight I consider that to be a win.
Not much consolation, but better than taking pills/powders/etc.
DIVOSH!