Avoid hypothermia – Never sleep in wet clothes, I tried this once, horrible idea. You should change out of your day activity clothes and into night or sleep clothes. You perspire during the day, and even with layers of clothes it will be likely the inner layers are damp although you may not realize it at the time until it’s too late. The dampness will cause you to chill at night. Leave your day clothes out to dry or air out overnight. Absolutely change your socks to a dry pair for sleeping.