Aim: The aim of this study was to determine the effect of smartphone use on sleep quality in adolescents (13-20 years) using youth center. Method: The descriptive study was conducted between May and August 2019 at a youth center within a municipality. The population of the study consisted of adolescents consisting of 400 adolescents aged between 13-20 years who were attending courses ... https://www.bekindtopets.com/great-save-3rd-Marine-Division-Coffee-Mug-deal-day/