What are the uses of Sun bath

In olden days our ancestors use to have sun bath. What are the uses of Sun bath?

It is useful to prevent depression
To cure insomnia
Absorption of Vitamin D
Skin irritations such as acne, rashes, eczema, and athlete’s foot can be cured by sun exposure.

Sasikanth you are asking same question in forum as well as in question answer's categories. I am not sure if this is allowed.

Devayani many persons dont answer it in answer but in forum we can get lot of answers.

Devayani many persons dont answer it in answer but in forum we can get lot of answers.

Sasikant, agreed that not many answer a question in the Q&A section, but this is a question for which you can get several answers on google search, also you need to decide whether you want a discussion on it or only an answer. So please do not ask repeat questions in both sections, especially when you can get answers easily!