Are naps good for health?

That depends: If you nap during the day and then can't sleep at night - then napping might not be so great. However, If you are sleep deprived or recovering from illness/ surgery - etc. then napping may be helpful. Some people in very hot countries may nap in the middle of the day - this can be adaptive.

Are naps healthy?: While some studies may suggest that a short nap during the day is beneficial, sleep hygiene recommendations argue against naps as they disrupt our normal 24-hour sleep wake cycle. Better to get higher quality sleep of good duration at night.