Help me please

Over the past 15 years when l am asleep something has slid in to my bed and tried to get on top of me , it all started after a friend had died it will only happen if l am sleeping on my own , l wake anothe to be able to say no and lcan feel it get off me the first time was so scary, my husband thinks l am talking crap. Please can you help me it dose not happen if l am not sleeping at my own place and l have slept in othere rooms in my home and it has happened when l have changed rooms to sleep.