Both twin studies and genome‐wide association studies (GWAS) have shown that insomnia is substantially influenced by genetic factors (Gregory et al., 2016 Hammerschlag et al., 2017 Hublin et al., 2011 Jansen et al., 2019 Madrid‐Valero et al., 2021 Taylor et al., 2015). As the authors state in their manuscript (Vgontzas et al., 2013), future research should examine the underlying genetics of this theory. The idea that there are two different types of insomnia based on sleep duration and that one subtype has a greater ‘biological’ component as compared to the other has not been widely tested. This theory states that there are differences between the subtypes when it comes to associated morbidity such as depression (Vgontzas et al., 2013). Insomnia is related to a wide variety of negative consequences such as depression, anxiety and cardiometabolic morbidity and mortality among others. In contrast, insomnia with longer sleep duration is not associated with physiological hyperarousal, but may involve sleep misperception, anxious‐ruminative profile and is more likely to remit. Specifically, it has been proposed that insomnia with short sleep duration (defined by the authors as <6 h) reflects a biological vulnerability (e.g., genetic predisposition), and is characterised by physiological hyperarousal, impaired neurocognitive functioning, increased risk of cardiometabolic morbidity and it is likely to persist. This theory states that these subtypes may differ in terms of their aetiologies, have different characteristics and are associated with different phenotypes. insomnia with longer sleep duration) has been proposed. In adults, a theory about two different types of insomnia (i.e., insomnia with short sleep duration vs. Insomnia has been extensively studied in adults, however, insomnia in adolescents is poorly characterized, underrecognized, under‐diagnosed, and under‐treated despite its high prevalence (de Zambotti et al., 2018). Prevalence of insomnia varies across studies ranging from 6% to 33% depending on the criterion used (Bixler et al., 2002 Ohayon, 2002 Ohayon & Sagales, 2010). Insomnia is one of the most common sleep disorders (Morin et al., 2015).
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