The most obvious reason to skip the clothes and go to bed in the buff is that it could lead to better sleep.
Your body temperature naturally lowers when you sleep and being too warm can lead to restless sleep or even insomnia.
Studies have made the link between being too warm while you sleep and suffering from insomnia.
In fact, it’s been shown that the best recipe for a great night’s rest is a room that is kept at 65 degrees, and not being too covered up.