system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do showers/baths refresh and energize?

A very large portion of animals feel refreshed and energized after being clean.  Humans feel more relaxed and comforted.

Is this due to chemicals in our brain, or something else?
gpt
We are imprinted from birth (and from shared genetic behavior) that cleaning is caring. Mother or Father both increase levels of attention and care when cleaning their young. This reenforces the social connect and yields a positive interaction. That behavior is then carried forward to older independent self-care rituals like bath and shower. It's further reinforced by the isolating ones self from sources of stress and personal rituals marking that time as a moment of self-care.