what do you do in your spare time?

since i'm currently studying in a university, i have my long break in school every Tuesdays and Thursdays.. what i usually do is review my lessons before my classes start and when i have extra time, i intentionally close my eyes and sleep so that when i enter my class, i feel renewed and that i won't get sleepy during the discussion.. in this way, i was able to understand my lessons better and i can retain them in my brain longer than listening to the discussion while feeling very sleepy.. :)