SleepNaked.org seems to be a one-man campaign in support of a good cause: sleeping in the raw. I hadn't realized that there were people who chose to sleep otherwise these days, but I guess the sinister forces of Big Pyjamas aren't to be underestimated.
Not only is sleeping naked more comfortable, but it's good for your health too. Increasing your level of comfort makes it easier for you to relax and sleep, so you get a better night's kip. The resulting deeper, longer sleep makes it easier for your body to regenerate and repair itself, and build up your energy for the day ahead.Link (via Digg)
If you sleep with a partner, being naked heightens the level of intimacy between you and you are likely to have sex more often. You may also feel closer to your partner as a result of sleeping naked with them.