Resting bags along with adjustable hoods or even receipt collars aid catch heat energy better during the course of cold nights

https://wiki-fusion.win/index.php/Keeping_Cool:_Staying_Comfortable_in_a_Hot_Tent_During_Warmer_Weather

Sleeping bags with adjustable hoods or draft collars help trap heat more effectively during cold nights, enhancing overall warmth and comfort while camping outdoors.