No, don't use other bedding. My roommate has a weighted blanket that weighs 20 pounds and she only sleeps with that. I know because while she was gone during her last hospitalization, I tried to be a good roommate by cleaning her bedroom (she had sand from July when she went to beach all summer on her floor etc.) and when I washed her bedding, her weighted blanket was the only blanket on her bed.

I don't know how helpful that info. is, but I found a link about weighted blankets and how hot/cool they are. I think it depends on the material they're made of:

A Weighted Blanket that Stays Cool? How to Know if It’ll Be Too Hot for You

I'm glad you were able to sleep 6 hours straight though!