Am i studying too hard for my tests?

im in college and i study alot for my exams, especially finals. for each midterm, i usually stay up for days to study for them. i mean like not continuously, i sleep for a few hours each day and then i crash right after i take my midterms. i just go home and sleep for 10 or 20 hours. is this healthy? will this habit of mine shorten my life expectency? ive been doing this for like a year now and i can actually feel my life expectancy getter shorter by the semester. last semester during finals week, i crashed after my last final, and slept for days. i didnt even kno what day it was or how long i slept until i checked. i slept for 3 days.