It seems foz and I are suffering from the same affliction the last couple days... Last night and the night before, I haven't been able to get to sleep before 3am (at least)...
I've no idea why. I'm tired as hell, but once I climb into bed, I'm left staring out into the black - wide awake.

I'm sure sleep deprivation will kick in at some point and correct things, but I'd really like that to happen sooner than later.