In my free time i do many activities, for example, play volleyball with my team of the university, play online videogames with friends or my boyfriend, Cook a new recipe to mefor myself or my boyfriend, study for futures/upcoming exams and finalesly just sleep, i love to sleep /sleeping¶
due to university i did not sleep enough, so thisese are the activities that i do in my free time

1) you cook *for* someone, not *to* someone:) and "myself" sounds more natural than "me"
2) good luck with the exams! apart from "future", you can also use the word "upcoming" not much of a correction, rather an advice:)
3) when you say that you love to do a certain thing, there are two ways of saying it: "i love *to sleep*" or *"i love sleeping*", with -ing