12. how long does it typically take for your muse to fall asleep?
James uses up so much energy in the day-to-day that when it's time for sleep, it is time for sleep and the man is out in about five minutes flat. It takes a lot of energy to be James Potter, that and hair tonics, and sleep is a great way to refill his amounts of one of those.
15. how many hours of sleep does your muse typically get?
He tries to get a full eight but isn't really willing to get less than five. Of course, with the way the world is the actual number of hours tends to vary pretty wildly depending on pranks, school load, and, of course, the three brilliant fools he's shared a living space with since he was eleven. Of course, there's always a night or two a month where he's guaranteed to get very little sleep at all, so he likes to try to stockpile it in anticipation.
20. does your muse have any pre-bedtime rituals or routines (like facial care, meditation, shower, medications, etc)? do they have any pre-bedtime activities like reading, playing video games, going on their phone, etc?
James Potter is a man of means and partially-earned vanity. He has a five step routine for his hair alone in the evenings, one perfected over the years especially since his hair becomes completely unmanageable without it. He also really values feeling clean and will insist on a shower every evening as well, something Euphemia drilled into him. He usually likes to talk with his friends before he goes to sleep, making sure they're doing ok and that the day wasn't too terrible.
22. is your muse sensitive to light while they sleep, or do they not mind it?
James sleeps like the dead and barring absolutely disaster or breakfast he is not waking up before he is good and ready. No amount of sunlight or moonlight is going to be stopping that.