Temperature control is the problem I have with a bag as I tend to sleep hot, that is why I am exploring the use of a quilt. Last spring I bought a cheap quilt, a Kelty Bestie, and with a high R value pad, I found I can sleep comfortably into the lower 40s F. If I add an insulated shirt, pants and heavy socks, I can drop the comfort temperature down to 30 F.
On my 2020 Colorado Mule deer backpack hunt I utilized my bag and after dealing with temperature control again, swore to purchase a good quilt.
I have the same issue with sleeping hot, and I’ve found that I sleep comfortably down to about 0 F in just a base layer using a EE 10 F Revelation with NeoAir Xtherm Max. Adding layers will get me down to about -10-15 F. Using my UGQ 0 F overstuffed Bandit quilt I’m comfortable to -15 F with base layer and about -25-30 F with additional layers. I think I sleep hotter than most, though.
