No i just get really hot when i do full exertion. I could probably do hard labour in the winter without a shirt on and still feel warm.
Also is it fine to wear shorts when sleeping?
Right. I know that men naturally have a hotter body temperature than women, so I do understand the difficulty. I've known women who are pregnant with boys get really hot, even in the wintertime.
For detailed questions like this, it seems prudent to simply do what was always done in Catholic cultures. The saints teach that modesty is not only for the sake of our neighbour, but for ourselves as well, and the presence of the angels. How that principle manifests in each daily activity, I am not entirely sure. Obviously there are times where nudity is proper, such as in the shower, for example.