friend. i know i said not to, but if you have a friend who is learning the same thing and you and will poke you if you drift off, then go for it. also the occasional giggle or comment between friends will keep you engaged and will stop you from drifting off.
so there you go, try and stay awake, and if you really must fall asleep, do like jack sparrow and paint eyes on your eyelids! good luck! 