sitting up while sleeping/ not able to wake up to any alarm cloc

Hey when I sleep I move around alot and sit up everynight, I can go to bed in one spot and wake up on the compleat other side of my bed I also am told by friends that I sit up while I sleep and sometimes I wake up sitting up, also I am can not be woken up by any alarm clocks I set my phone alarm to go of every 5 mins for hrs at a time and I also have an alarm clock that is very loud and still it does not wake me up what is this called and how do I stop this can you help me?