Irregular Sleep

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Does anyone have any tips on fixing irregular sleep patterns? I've had sleeping problems my whole life where my mind can't settle down and I can't fall asleep even laying in bed for hours. On top of this I sleep through alarms and can only be woken up through someone shaking me awake.

some history:
In elementary school my mom worked from home and could wake me up for school. In middle school I had 5 alarms I always slept through and my parents paid another classmate to come and wake me up for school every morning. I wasn't diagnosed with any condition but I got put on lots of meds to relax or fall asleep (melatonin, etc.). The meds made my sleeping even worse and I was late or absent for over half my classes in the 2 years I took them. During highschool I moved in with a friend who would wake me up and drive us to class which helped a lot. I increased my exercise to 2 hours a day to try to exhaust myself but the problem still persist and the only way I could get to school/work was from another person assisting me. During college I moved in with my girlfriend and switched my hours at work so she could help wake me up. As the years went by this started to take an emotional toll on my girlfriend as my sleeping was all over the place. 5 years later I still couldn't get myself under control and we had to part ways as it became too much to bear. Now with no human contact I started to miss work unable to wake up from my alarms and had to quit. I have enough savings to last awhile but I'm on a ticking clock and have no idea what to do.

tldr;
I can't function in this world with my irregular sleeping.