Feeling like someone is accessing my room at night in the psych ward

Yes, I know. ”psych ward” is enough to make many believe I’m imagining it. I’m not. I’m not hospitalized for anything related to psychosis and never had such thing in my life. So I’m 100% this is real. For context: I’m in a unit with 20-30 people. Most of the rooms here consist of rooms for two people and every room has its own bathroom. I however have been moved from a shared room to a room alone a week ago. We’re supposed to be in our rooms by ”11p.m”. From this hour there is also a nightshifte nurse who is supposed to check the rooms a few times throughout the night. At first, I noticed nothing unusual. But 4 days ago when waking up I started noticing small things like the toilet lid being up, while I always keep it down. I rarely pee, usually two times a day and never at night. So I’m 100% sure that I close the lid every time I go. This kept happening over the course of 3 days, but this morning I woke up seeing a piece of toilet paper floating in the toilet, confirming that some had used it without flushing. Perhaps to avoid waking me up. I have no history of sleep walking. Then, I also woke up to find a half opened bag of chips I had stored in my closet the evening before, now barely with anything left in it. I left the bag of chips filled for 1/2 and when I opened my closet I noticed it had reduced and only 1/4 seemed to be left. All the rooms are connected, so you can easily enter each room with no problem, except for getting caught by the night shift nurse. But maybe it is the night shift nurse. I feel like im going more crazy than when I came in. What could be a possible explanation to this?