Are you putting in contacts?
Maybe it depends on their ago. Like babies they stick to very bright/bold colors like YELLOW , PINK , WHITE. When they get older other colors start to stand out more
Answer:
It will be endorphins
Explanation:
any of a group of hormones secreted within the brain and nervous system and having a number of physiological functions. They are peptides which activate the body's opiate receptors, causing an analgesic effect.
I would say making sure I get plenty of rest and water/food which is the top self care priorities