DesertMusician:
Echoing Sk880...that was my first thought also. Sometimes I'll do an all-nighter, but what those odd time sessions usually involve editting, so, yes I'll be wearing phones.
If you're recording, use your monitors, not headphones. Unless you need phones for some editting/scrubbing etc.
I'll use a single phone(1 side) for recording some vocal parts, but that's really all.
Good Luck....
...and see your Doctor....before you do any permanent damage!!!