Not to be overly dismissive, but sounds like the guy needs better sleep habits. My mood is weakened by one day of bad sleep, but oh my, if I get two bad sleep nights in a row, my mood is atrocious.
Sounds like a typical hour to go to bed and get plenty of good sleep to me.
Only after 3-4 AM it becomes hard for me to get high quality sleep, because waking up after 11-12 AM means waking up to lots of noises from outside the window - but that highly depends on where you live (I have a playground and kindergarden near on the bedroom side, so that's probably an extreme case). It also means trying to sleep when birds become loud, although some people may actually like that.
Everyone have bad days, Find what makes you feel good
- Go for a walk - Get a drink in your favorite bar - Play some computer games (When I play DOTA I forget everything to be honest)