Probably due to ADHD and few other things, like PTSD lol.
Preach lol -- that's why I'm here to just watch the thread!
I think I change up what I do every day.
Because of brain damage, it only takes one day of skipping something for me to forget it was ever a habit. (Unless it's a bad habit :P kidding, fortunately those are also affected.) And my brain is so silly that I genuinely didn't notice this was happening until my friend witnessed it and told me about it!
Things to keep up with, though, lately, has been:
Morning, I wake up, and it takes me around 2 hours to wake up enough to get anything done. So, I start by playing a phone game I like (usually one specific game that's my current favorite) while laying down. I have 3-6 cats in the bed each taking turns cuddling with me, and the doggo next to my on her beds on the floor right by the bed. (I had to downgrade to a twin bed, so theres not a lot of space lol)
Then I take my pill medications and make sure I'm hydrated (which I'm also doing while waking up, because it helps me wake up faster).
Then I go to the restroom, take my inhaled medications, and brush teeth.
Sometimes I do physical therapy somewhere in there.
Then I eat, do some critter care, and then.... Do tasks, idk. Whatever my 1 or 2 main tasks of the day are, as I can only do 1 or 2 types of activities a day.
Weekly routines are part of daily for me, because I'm usually only able to do my tasks 1-3 days a week, usually with days in between. Depends, though.
And then, come to think of it, my evenings are messy lately, but generally do critter care, I shower, brush teeth, get into some clean clothes, and take my pill medications and inhaled medications, then go into bed with my phone either on the desk across the room, or under my pillow. My anti-insomnia meds help me sleep quickly
Daily routines are something I've been working on in therapy, though with minimal progress so far, but I have some things down :)