+1 on the likelihood of the socks being too tight.
I wear a pair of socks that isn't tight at all when sleeping. If I expect it to get cold I'll wear a second pair - only a good bit looser than the first. Lastly, make sure your toes aren't pressed too far into the end of the quilt/bag so avoid losing loft.
Let us know what finally solves the issue for you.
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