Ahh you'll pull through alright! Just find a nice place to sleep under your desk, Seinfeld George style....
I once arrived at work on a Friday morning after seeing Carl Cox the night before. I'd had 1 hour of "sleep" and then into work! Nearly passed out buying an orange juice for breakfast, then as soon as I got in my boss wanted to have a big meeting. Still can't remember what is was about! Eventually I faked illness and went home at midday so I could watch a day-night cricket match on the tv!
My advice, fake illness and go home. Instantly you'll be having a better day