We spend approximately one third of our lifetime in sleep, a complex physiological process which is an established health determinant. In the last decades, it has been demonstrated that reduction of sleep quality (i.e., due to a sleep disorders) or sleep quantity (i.e., sleep deprivation) and alteration of sleep regularity are associated with increased morbidity and mortality [1–3]. Therefore, in recent years a growing interest has been focused on sleep as a major risk factor for poor outcomes in the general population.
