Drink coffee. I used to drink 3 cups everyday because almost
every night working part-time. Reached home, bathe and wait for
hair to dry, sleep at about 12.30am or 1 am everyday and wake up at
5am everyday. But I always reach school early so before school
start, I just lie on the bench and sleep.
Otherwise, I just take a quick nap in lectures. Sleep for a while,
after that wake up damn refreshed. But sometimes really too tired,
slept all the way till lecture end. Other time, if not so tired,
half-way sleeping hear important points, wake up and start taking
notes.