Weight has something to do with it. Quality matters with wool products. My BIFL wool blankets are only used during the coldest nights of winter because of how effective they are.
Wool is also going to allow evaporation. Lots of fleece doesn’t. So basically you’re stewing in your own night farts and associated moisture and that may give you a feeling of warmth. I’d venture to say that you are actually warmer with wool, there is just air exchange and that is perceived as cooler.
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