I can't stay awake

25M 5'10 70kg/154lbs, First time asking here, but this has become so bad that I need to figure out what causes it

over the last 2 months I have had serious problems with sleep, I sleep from around 11pm to 8 am, but can hardly stay awake for more than a few hours without having to lie in bed and take a nap, this has halved my overall time awake during the day, at first I thought I was just burnt out, but now that it hasn't gone away I don't know what to do, I have done everything my doctors have told me, I eat 2-3 healthy meals a day, I sleep 8-9 hours consistently at the same time of day, but nothing has changed, it's starting to worry me a lot as I can barely focus on my projects and work

I have some disorders that might have affected it, Autism, ADHD, STPD and Bipolar, I take 5mgs of Aripiprazole and 100mg of Sertraline every morning

Please help me, anything would do, thank you in advance