Sleeping in the nude
There is a widely held misconception that sleeping in the nude provides better insulation and warmth than sleeping with a layer of clothes while in a sleeping bag. This myth may have some basis of truth, since sleeping in the nude is actually better than sleeping with wet clothes. Do not sleep in the clothes you’ve worn all day. They will be damp, just from normal absorption of perspiration. Instead, pack a pair of long underwear or fleece and keep it dry in your pack. Change into this layer just before crawling into your sack. In warm weather camping, where nighttime temperatures don’t require insulation and added warmth, sleeping with little or no clothing is fine, and generally quite comfortable. I'm all for outdoor adventure being comfortable, even if it's unpredictable.