Dead tired...sleepy too

It's now wee hours in the morning....been typing since the night before. I'm now extremely tired and exhaushted. Sore all over(thanks to my stupid lausy plastic chair) and my wrist hurts from all the non-stop typing(feels like as if it'll break off any moment now)...still got 14 more type of engineering jobs(the things that i have to type)to go. Not to mention that i keep on typing wrong words too. Getting annoyed. Should i go on or should i just go to sleep? A hard decision to make.....it's due by 830 later today. Hmm....go to sleep then wake up few hours later to finish off my typing? Would i be able to finish it in time if i do so? Even worst...would i be able to wake up if i go to slumber land? But then if i don't go to sleep...would i be typing through the night, not getting any sleep at all? Argghhh...(i'm really going nuts now)....eyelids are dropping...must keep awake...where is my coffee?....zzz....