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Sleep apnoea is a condition characterised by cessation of breathing during sleep. Obstructive sleep apnoea refers to episodes of upper airway blockage during sleep.

The term central sleep apnoea encompasses a group of sleep-related breathing disorders in which respiratory effort is diminished or absent in an intermittent or cyclical fashion during sleep.

Snoring is the vibration of respiratory structures and the resulting sound due to obstructed air movement during breathing while sleeping.

Periodic limb movement disorder (PLMD), previously known as nocturnal myoclonus, is a sleep disorder where the patient moves limbs involuntarily during sleep, and has symptoms or problems related to the movement.

Narcolepsy is a rare neurological disorder that affects the brain’s ability to regulate normal sleep- wake cycles.

Hypersomnolence is a condition characterised by excessive sleepiness, which interferes with your daily activities.

Insomnia is a sleep disorder characterised by a difficulty in falling asleep or inconsistent sleep throughout the night resulting in too little or poor-quality sleep and a feeling of exhaustion when you wake up.

Humans follow a 24-hour biological rhythm called the circadian rhythm, controlled by light and darkness of the surrounding environment.

Parasomnias refer to abnormal behaviours that occur during sleep. Parasomnias include nightmares, night terrors, sleep walking, and sleep talking, head banging, wetting the bed and grinding teeth.