I’m thinking it might have to do with cold air on skin and cool air breathed in while the rest of the body is warm under the covers. So, the contrast in temperature is what feels so good?
Edit: The body controls temperature through sweating (warm blood inside sent to the skin to cool). Under the covers the skin is warm with cool breathing brings cooling to the inside without moving blood. Maybe the body temp control system is operated differently and that’s refreshing. Just thinking out loud.
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