system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it more comfortable to sleep in a cool room under warm blankets than just to sleep in a warm room?
gpt
Blankets offer physical contact where an empty room does not, and that can be comforting. The ancient technique of "swaddling" babies (wrapping them in blankets) to calm them and keep them quiet is an example of this. 

They also prevent wafts of air from moving across your body and cooling it, and they can be hiked up to cut off light. And on top of these reasons, they're also highly adjustable - you can take them off to immediately cool down, but a room's temperature isn't so easily warmed or cooled in some cases, and particularly not without having to get out of bed to do it.