Sometimes I don't sleep until 3am-4am on average and I don't get myself out of bed until about 12pm, sometimes 1pm. I do have a diagnosis of PTSD but then again I also watch YouTube videos at night, sometimes I leave the audio on because sometimes it helps. 

I do set alarms for 8.30am and stuff but I end up hitting snooze and sleeping until 12

I do sometimes go to the gym pretty late around 10.30-11pm and I thought it would help, but turns out late night exercising negativity affects sleep

Any tips?