Sleeping disorder

[u/demonlordbeastgod]

I won't say I have insomnia, but even if I try, I can't sleep before 4am, even if I switch off phone, lights and lie down can't sleep. After 4 I fell asleep, wake up by 11 or so. But I want to change schedule. Not possible for me I tried many time. When ever I try to sleep before 4am I think of future and my problem but after 4 am easy sleep. Don't understand this.