I stayed at an apartment in Bangkok

I stayed at an apartment in Bangkok with my roommate. Her name is Ann. One night on the last month while i slept in my room. I dreamed and in my dream i saw black shadow. Black shadow resemble a human. It hold and tow my body down from the bed. I tried to call Ann come help me but she did not hears. Suddenly i woke up. I was found i slept on the bed as usual. I told Ann and my friends in the morning next day they said i should go to temple or offer food to monk. Then I do that.