Jet Lagged
Its the worst state to be in. You want to sleep at 3 in the afternoon and wake up at midnight to find everyone has just gone off to sleep. Its even more depressing when you look out of the window and the sky is still pitch dark.
You wake up at 4 in the morning and are so so hungry. 4 am is no time to cook food!
You drink cups and cups of coffee just to try to stay awake in the afternoon. So much so that coffee starts making you feel sick.
Its like this half awake state, you want to sleep but you can't, you want to wake up but there is nothing to do!
Its heartening to find fellow jet laggers also up with you early in the morning though :P