Thats actually one of things I enjoy most about being a webmaster...
I can follow my own body clock. If I wanna sleep... I sleep. If Im awake, I work... The web doesn't stop when I sleep... I still earn money regardless, and anything that arrives in while I sleep, emails etc, I can just answer when I wake up...
No ones gonna die because an email doesn't get a reply for a max of 12 hours occasionally...
So go with your natural flow and sleep when you want
