I do not sleep well in clothes. I have had to wear long johns and a fleece to bed when temp dipped way below my bag rating. I normally prefer just shorts or undies. As for dirt I carry a Kitchen sink. I cut the top off a Gallon milk jug and take a nice sponge bath after supper. This is better than slepping in my dirt! My long Johns wouldnt smell realgood to sleep in after hiking all day! I am a warm sleeper though.