When getting ready for a good nights rest after a long day of adventuring, it is best to clean yourself as much as you can as you may have a lake near you or a portable shower. Then have a fresh pair of clothes that you can change into as that is the best way to be comfortable in your sleeping bag. The last thing you want to do is get ready to go to sleep and still be wearing the clothes that you hiked in all day. The sweat, dirt, and muck will not only have you uncomfortable but can also stink up the inside of your sleeping bag and if you are sharing your tent with others, this may be a nuisance to them as well as yourself.