Misc advice from a neurosimilar(?) person:
1. It might help to know you’re not alone (at all). I’m lost and burned out for the (n+1)th time myself.
2. For me at least, recovering from burnout needs to be an active process. Time alone does not seem to heal it, and actually seems to calcify it. I’d try volunteering or some sort of non-work related “work”.
3. Staying up (extremely) late is mostly behavioral for me—e.g. not being satisfied with my day and wishing I had done more, so I cling to the “day” and stay up til the birds chirp. Then I’m stuck in that schedule for a long while. I have no real solution to this and it’s not really advice, it’s just an observation that might resonate.
4. Try not to label yourself in such a way as, “I am ADHD, therefore I cannot do {x, y, z}”. Especially with mental health, it’s more accurate to think of it like, “I have a cluster of symptoms / patterns of behavior that could probably be classified as a type of ADHD”. Some of those patterns you may be able to control directly (like with meds or therapy/strategies/habits), some you may have leverage over indirectly via feedback mechanisms (e.g. relieving underlying sources of anxiety/burnout could help your sleep, which will keep burnout in check).
5. If you’re able, try doing a volunteer trip that forces you to go to bed and get up early. More specifically, if you like the outdoors, do a backcountry trail crew trip. It’s easier to fall asleep when there is social reinforcement, constant physical tiredness, few artificial lights, and plenty of weird sounds in the blackness. I did one week with (trailcrew.org) after an intense burnout period and it had a lot of benefits for me.
6. You could always find a more flexible job (remote, flex schedule, etc). If you work with a healthcare provider, you should be able to get reasonable accommodations—if you’re in the US you have this legal right. Go through HR, not your supervisor. If your company doesn’t have HR (startups?), try working for a megacorp where their incentives and ability to accommodate are probably higher. (PS: “Reasonable” doesn’t mean that it has to make managers feel warm and fuzzy, it just means you can’t insist on, say, teaching schoolchildren between the hours of 8pm-4am, for example. If anyone whines about “fairness”, just say: “I have an alternative work schedule for personal reasons” = “f..k off”). Anyways, don’t set yourself up to get fired because you didn’t arrange for fair accommodations—advocate for yourself.