I used to do this quite often in my life. Since it could be a good way for me to rest my mind and release my bad emotions in life, especially after a hard day of work and study. By doing so, I would feel quite relaxed. But the problem is that currently I am living in the city center, I don't think that I could see many stars at night because of the environment problems. So, if the sky seems pretty clean I would do it very often at night. That is it.