Sometimes when Dave employs the Crevasse strategy, he likes to also take the opportunity to stretch. This is the perfect time to stretch, because Dave is already warm, due to being covered on three sides. This averts an issue that can arise from stretching in the winter months or in front of an air conditioner. By combining stretching with the Crevasse, Dave avoids exposing too much of his body's surface area to cold air.
Again, not so much a problem these days, but Dave likes to plan ahead, developing strategies months in advance of when he will need them.