I have a 20 degree Golite quilt. I really like to sleep super toasty warm and when it's pretty cold outside, I am not toasty warm. I kind of suffer through the night even though I can sleep down into the upper 20s with the addition of using my down jacket as an extra blanket inside the quilt. I'm still suffering a bit though with little drafts, with waking up and having to adjust the jacket, having bits that never quite warm up, etc.
I've been wondering if I could double up on sleeping bags. Could I get a 2nd quilt or bag and just layer the two? Does anyone make a down "blanket" I could use inside the bag or some other thing that I haven't even heard of? Or would it just be better to get a zero degree bag for the cold nights? I've tried down pants but when I bend my knees, my knees get cold.