As you said he sleep till 2 pm, first check with him whether he sleeps or just thinking thinking when he sleep. Who think lot they always get disturb in their mind and your friends needs lots of concealing towards positive thinking for being self satisfy with living for today. I think we have to take our past things and challenges as learning and experience not as feeling regrets doing that. And your moral support will help a lot to change him as I feel.  Everybody have problem in their life.
Keep smile in your face!