Quality sleep refers to a restful and refreshing night's sleep that leaves you feeling well-rested, rejuvenated, and alert during the day. It is essential for optimal physical and mental health, as it allows your body to repair itself and promotes cognitive functioning. Quality sleep involves getting enough hours of uninterrupted rest, falling within a normal range of sleep stages (light, deep, and REM), and experiencing minimal disruptions such as snoring or sleep apnea.