“…Although an extensive meta‐analytic review found that sleep quality is more strongly associated with academic achievement than sleep quantity (Dewald et al., 2010), other studies indicated that sleep quantity is associated with academic performance among adolescents, independently of sleep quality (Meijer & van den Wittenboer, 2004). For example, compared to long sleepers, short sleepers may experience relatively less rapid eye movement (REM) sleep that may benefit a variety of functions (e.g., memory function, the development of brain and sensory system, and emotional and social functions; Darweesh, El Beh, Hashem, & Nagy, 2021). Moreover, compared to sleep quality, sleep quantity may better represent two extremes, including short sleep duration as well as long sleep duration, both of which may have a detrimental effect on academic achievement (Vedaa, Erevik, Hysing, Hayley, & Sivertsen, 2019).…”