I see little dark circles around my kids eyes. is it some deficiency,?

A. Dark circles are due to 3 or four reasons one of the most common reason would be having too much of screen time which has become extensively common these days second would be of course efficiency of multivitamins and nutrients in the body and third could be having improper sleep that is at least the child should have sleep for 8 to 9 hours in this age in the night