If i feel the need to sleep all the time i bruise easily and can not get enough to drink what could it be?

Hypersomnia: Not sure how old you are, but its possible you may have a rare syndrome called klein levin syndrome where you sleep, drink, eat a lot and present with bipolar like symptom, this is an assumption although sounds unlikely in your presentation. I would rule out medical causes of low platelets, get cbcd, cmp, ua, thyroid panel etc, r/u sleep study, Depakote induced low platelets and siadh.