A student in India tied his hair to a nail while studying to keep himself awake

This was probably 100 years ago

I probably will just fall asleep with my hair pulled back anyway

That is a terrible way to study. If you are falling asleep while studying then you are better off just going to sleep. Anything you study about in such a state will just be forgotten due to your brain telling you to GET SOME SLEEP. This is especially true if you have an exam/test the next day.

Mood