Being Visited Every Night When I Go To Bed

I am a 63 year old widower. About two months ago when I go to bed there is something I feel sitting down on the side of the bed. Now I feel them trying to get my pillow I put between my legs at night. I am a side sleeper, so whatever side I face they go to the back side. It happens every night when I go to bed. Within the first five minutes they start. I lay there when I feel them on the bed I raise up and they quit and start again as soon lay back down. I would really like to know if anyone else has ever had this happen. I just lay there until I go to sleep. I have never said anything to whatever it is. I would just like to know what it is and should I be afraid of it. I lost my husband in 2011 with a massive heart-attack. He was not having trouble with his heart. I never got to tell him goodbye. I want to think it is him I am feeling, but I don't know what to do to find out. I am not scared of it. I live by myself. I doesn't bother me any other time only when I go to bed. Please can someone help me to figure this out. There has been a couple of times that I stayed the night at my mother's house, and I could feel something sit down on the side of the bed. A couple nights ago it felt like they had laid down on the bed. That was the first time it had happened. I am at my wicks end about this. When I talk to my family I think they think I am crazy. None of them has ever experienced anything like this and I probably wouldn't believe it myself if it wasn't happening to me. So please can anyone help.