i had a weird few weeks in recent times where i struggled with this very strange degree of sleepiness. i was eating okay and sleeping okay, so it wasn't at all normal for me. i never figured out what it was or if it was related to another part, but i recently learned more about a young part who is always really sleepy and wants to have a nap...though i only dreamed about her to learn about those things but did know she existed, her name, and age, etc., just nothing much about her until then.

sometimes, blood sugar also might be a factor; i am not 100% sure though.

as for it maybe being a part, i also don't know since you know your own system or probably more than anyone else anyway.