Sleep quality refers to how well a person sleeps, encompassing factors such as duration, depth, and restfulness of sleep. Good sleep quality means waking up feeling refreshed and alert, while poor sleep quality can lead to fatigue and difficulty concentrating. Several factors can influence sleep quality, including sleep environment, stress levels, and sleep disorders like insomnia or sleep apnea. Maintaining a consistent sleep schedule and creating a comfortable sleeping environment can help improve overall sleep quality.