Cold feet while sleeping? Consider your options. Recently I was out backpacking and I underestimated how low the temperature was going to drop. It had been unusually warm the week before and I let that influence my choices in the gear I took on my trip. When the temperature dropped during the night I used everything I had to supplement my sleep system but my feet were still cold. I discovered a trick that I’ll share that you may just come in handy one day.