What Are the Different Types of Sleep Disorders?

Key takeaway: Sleep disorders can affect sleep timing, breathing, movement, alertness, or behavior, as well as the ability to sleep. Similar symptoms can have different causes, so persistent problems need assessment rather than a diagnosis from a symptom list. (MedlinePlus: sleep disorders)

This guide introduces six broad groups. It is not an exhaustive list or a diagnostic checklist. A useful starting question is what is troubling you most: being unable to sleep, struggling to stay awake, sleeping at difficult times, or something that happens during sleep.

Insomnia disorders

Insomnia involves difficulty falling asleep, staying asleep, or returning to sleep after waking too early. An insomnia disorder includes effects on daytime functioning despite adequate opportunity and circumstances for sleep. Chronic insomnia follows a persistent pattern, rather than one bad night. (AASM: insomnia definition)

Cognitive behavioral therapy for insomnia, or CBT-I, is generally the first treatment recommended for chronic insomnia. A relaxing routine can help support sleep, but routine changes alone are not equivalent to a full CBT-I program. (NHLBI: insomnia treatment), (AASM: behavioral treatment guideline)

Find sleep or insomnia therapists on Psychology Today. Ask each provider whether they offer CBT-I and about their specific training and experience treating insomnia.

Sleep related breathing disorders

Sleep apnea causes repeated interruptions in breathing during sleep. In obstructive sleep apnea, the upper airway becomes blocked. In central sleep apnea, the brain does not send the signals needed to maintain breathing properly. These are different mechanisms, so assessment matters. (NHLBI: sleep apnea)

Frequent loud snoring, gasping, witnessed breathing pauses, or unexplained daytime sleepiness are reasons to discuss sleep apnea with a healthcare professional. For a fuller explanation, read Do I Have Sleep Apnea? (NHLBI: symptoms and assessment)

Circadian rhythm sleep wake disorders

Your body clock helps organize when you feel alert and when you are ready for sleep. Circadian rhythm disorders involve a mismatch between that timing and the schedule you need to follow. Someone may become sleepy and wake unusually early, or be unable to fall asleep until very late. Shift work and travel across time zones can also create timing problems. (NHLBI: circadian rhythm disorder types)

Being an early bird or a night owl does not, by itself, establish a disorder. Whether the pattern conflicts with daily responsibilities and causes problems is important. Discuss the full schedule with a clinician before trying to shift it with supplements or light treatment. (NHLBI: circadian timing and risk factors), (NHLBI: treatment planning)

Sleep related movement disorders

Restless legs syndrome causes a strong urge to move the legs, often with uncomfortable sensations. It is typically worse at rest in the evening or at night, and movement can provide relief. Leg cramps and other conditions can feel similar, so the description and context matter. (NHS: restless legs syndrome)

Periodic limb movements are repeated movements during sleep. Their presence does not automatically mean periodic limb movement disorder. That diagnosis also requires clinically significant sleep or daytime problems that are not better explained by another condition. (AASM: 2025 movement disorders guideline)

Disorders of excessive sleepiness

Central disorders of hypersomnolence include narcolepsy and idiopathic hypersomnia. Narcolepsy affects the regulation of sleep and wakefulness and causes marked daytime sleepiness. Some people also have cataplexy, brief muscle weakness triggered by emotions, but not everyone with narcolepsy experiences it. (AASM: central disorders of hypersomnolence), (NIH: narcolepsy)

Idiopathic hypersomnia can involve long sleep, difficulty becoming fully awake, and feeling unrefreshed. Excessive sleepiness means a tendency to fall asleep, which is different from low energy alone. A clinician also checks for insufficient sleep, medicines, sleep apnea, and other explanations before identifying the cause. (NHS: excessive daytime sleepiness), (MedlinePlus: sleep disorders)

Parasomnias

Parasomnias involve unwanted experiences or behaviors during sleep or the transitions into and out of sleep. Examples include sleepwalking and sleep terrors. (MedlinePlus: sleep disorders overview)

REM sleep behavior disorder can involve acting out dreams, sometimes with movements that injure the sleeper or a bed partner. New, recurrent, or dangerous nighttime behaviors deserve medical assessment. Reduce immediate injury risks by clearing hazardous objects from the sleeping area while seeking advice. (AASM: REM sleep behavior disorder guidance), (NHS: sleepwalking)

How do I find the right help

Start with your primary care clinician if sleep problems persist or interfere with daily life. Describe your sleep schedule, daytime symptoms, medicines, and anything a bed partner has noticed. A sleep diary can help; testing or a sleep-specialist referral depends on the suspected problem. (MedlinePlus: diagnosis of sleep disorders), (NHLBI: assessment and sleep diaries)

Do not drive when sleepy. Pull over safely if you become drowsy while driving. (NHTSA: drowsy driving)

This information is for general adult education and does not replace individual medical advice.