I am a little surprised, but pleased that so many people have been interested in trying this. I(male) and a female friend of mine tried this back in May. Both of us were doing this for the first time. We were both a little nervous about it and both felt awkward. We both loved sleeping naked. We talked about it for a long while until it became old news. I felt more rested when I awoke. I felt so comfortable and it made going to sleep feel like more of a treat. I am tempted to think that it really effected me mentally. I will say that there is one negative side effect (for guys only). After sleeping in the nude for a week I had a very noticeable increase in the number and intensity of penis erections. I had an erection like all day every day.