I have the same thing happen to me. I don't know what it is. I think it might be spirits trying to communicate with me sometimes. Also, I have visions right as I first wake up before I open my eyes, and I'm not asleep, I am awake. And you're right about things being random. I hear and see really random things and people. The other day though, I had something happen that made me think it might really be spirits. I was awakened by my bed being shaken hard and something shook me and I could still feel it shaking me as I woke up, and then the covers were lifted off my legs and onto the foot of the bed. My cat refused to come up on the bed with me for over an hour after that.