Only sleep 4 hours per day?

I only sleep 4 hours monday to friday. I take a long time to do my homework and study so I usually go to bed at 2 and wake up at 6... Going to bed at 3 and 4 happens alot too. I sleep for about 8 on saturday and 6 on sunday. What are health risks? I do feel tired but I dont have a choice. This has been... show more I only sleep 4 hours monday to friday. I take a long time to do my homework and study so I usually go to bed at 2 and wake up at 6... Going to bed at 3 and 4 happens alot too.

I sleep for about 8 on saturday and 6 on sunday. What are health risks? I do feel tired but I dont have a choice. This has been junior/senior year of high school.
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