I am amazed that you think Warm and Natural batting is lightweight! My brother was just complaining to me yesterday that a quilt we made for him with this batting is too heavy.
You might like Hobbs or Quilter's Dream wool. It's light enough that you could use two layers of it. A little pricey, but everyone who uses wool batting seems to love it. Wool and cotton both "breathe", so I'm not sure you would sweat under it. Polyester doesn't breathe, so that would be more likely to allow sweating.
For lots of weight you can use denim, but it won't add much warmth.
Is there some reason why you like to have the ceiling fan on when the room is cool? I guess I would just turn the ceiling fan off unless my husband objected.
Do you have to have the ceiling fan on at night?