Occurs when the upper airway becomes partially or completely blocked repeatedly during sleep, causing breathing to stop or become reduced. Common signs include loud snoring, gasping or choking, witnessed pauses in breathing and daytime sleepiness.

Occurs when the brain temporarily fails to send the appropriate signals to the muscles responsible for breathing during sleep. It may cause pauses in breathing, repeated awakenings and fragmented sleep.

Persistent difficulty falling asleep, staying asleep or waking earlier than desired despite adequate opportunity for sleep. It may lead to fatigue, irritability and difficulty concentrating.

A neurological sleep disorder characterized by excessive daytime sleepiness and an increased tendency to fall asleep. Some people may also experience cataplexy, sleep paralysis or vivid dream-like experiences.

A disorder causing uncomfortable sensations in the legs and an irresistible urge to move them, often becoming more noticeable during rest and in the evening or at night.

Repeated, involuntary limb movements during sleep that may interfere with sleep continuity and quality and may contribute to unrefreshing sleep and daytime tiredness.

Unusual behaviors, movements or experiences occurring while falling asleep, during sleep or while waking, including sleepwalking, sleep talking and night terrors.

Occur when the body's internal biological clock is not aligned with the required sleep and wake schedule, causing difficulty sleeping at the desired time, waking up or staying alert during the day.

A persistent difficulty staying awake or alert during the day. It may be a symptom of several sleep disorders and can affect concentration, memory, performance and safety.