Sleep is a physiological process that is essential for survival, as it is involved in many vital biological functions. Sleep maintains the psychological, emotional, and metabolic balance and restores the energy and disposition to perform the daily activities. Sleep also has a great impact on mood, as poor sleep quality causes stress and irritability. Sleeping well and enough, according to the recommended time for each age group, improves attention, memory, behavior, learning, and emotional regulation. On the other hand, sleep deprivation and disruption can lead to health problems such as diabetes, immune system alterations, and psychological disorders. Therefore, sleep quality and quantity are fundamental for well-being and longevity.