I may have had a little cat nap at the nursing desk

I've been off work for three weeks on a sick leave. I was only told at 2pm today that I'd be starting tonight at 10:45pm. I only slept about 4 hours the night before and had no time to nap before hand. I'm so sleepy and I accidently fell asleep for about 10 minutes in the nurses station.. help me stay awake.