Sleeping 4-5 hours every night

Usually go to sleep around 1 am, wake up around 6. There are days where I can't fall asleep until 5 am, then I wake up around 9 am. I don't have a job or busy schedule. I'm at home/in my bedroom a lot. I do go on walks or run on the treadmill usually everyday. Not sure what my problem is but i'm looking for some advice. Is getting this amount of sleep worrisome?