Were you wearing the same socks you had worn all day?
I learned from my mother who was a Campfire Girl counselor that you should change into fresh socks before bed.
You can wear the socks you wore to bed the following day but shouldn't wear the socks from that day to bed.
Lately I've enjoyed my cheap down booties. My sleeping bag also has a small pocket in the foot to hold a handwarmer.. a bit of non-professional sewing could easily add such a pocket to your set up.
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