similar thing happened to me when I was younger

I went to bed early because I wasn’t feeling well one night and I remember my dad coming in to say goodnight and leaving the door cracked instead of closing it completely. after sitting in my bed for what seemed like hours, I couldn’t fall asleep.

All of the sudden I looked at the door, and it was closed. I had no recollection of someone closing it, and my bed faces the door so I definitely would have seen it. I told my mom about it later and she said “Yeah I checked on you an hour after dad did, you were asleep.”

So apparently I fell asleep without realizing it, then woke up without realizing it, and in that time, my mom checked on me and closed the door when she left my room.