A hangover of sorts

I had my annual holiday party on Saturday. I was up late on Friday, up early on Saturday getting ready. I went all day with hardly a break, and almost fell asleep on the couch after everyone left Saturday night. I slept in late Sunday morning, went to yoga, saw a movie, then came home and took a nap. I couldn't shake the tireds all day, and pushed myself to stay up until 11p.

And yet, I lay in bed for three fucking hours and could not fall asleep.

Now I've called into work, and am struggling with the blues. Everyone is annoying, and nobody cares. What the fuck is happening to me?