As I am sure you realize, nobody here can diagnose you with delayed sleep phase disorder. Have you visited a sleep specialist to discuss your concerns?
You might find it helpful to keep a sleep journal for a couple of weeks to record when you go to bed, when you get out of bed, and roughly how much sleep you get on an average night.
This will help you determine whether you are allotting an appropriate amount of time for sleep (many people who struggle with sleep allot too much time for sleep and/or go to bed before they are sufficiently sleepy for sleep).
You can then try gradually advancing your sleep window by between 15-30 minutes each week so it starts (and ends) a little earlier. Over time, this may help you get back to a more appropriate sleep schedule.
I hope this helps.
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