sleep-wake disorders

Diagnostic Criteria (F51.01 - 307.42)

Predominant Complaint: Marked dissatisfaction with the quality or quantity of sleep leading to significant impairment in daily functioning.
- Symptoms:
  - Difficulty in initiating sleep (sleep-onset insomnia)
  - Difficulty in maintaining sleep (sleep-maintenance insomnia)
  - Frequent early-morning awakenings
Frequency: Symptoms must be present at least 3 nights per week for a duration of over 3 months, indicating a persistent issue rather than a transient one.
Exclusion Criteria: The disorder cannot be better explained by another sleep disorder (such as sleep apnea) or by the effects of substances (medications, recreational drugs, etc.).
Specify:
- With mental or medical comorbidity: Specify if there are co-existing mental health issues (e.g., anxiety, depression) or medical conditions (e.g., chronic pain, respiratory diseases).
- Episodic, persistent, or recurrent: The pattern of insomnia symptoms.

Prevalence

Approximately 1 in 3 adults report experiencing insomnia; around 10-15% experience significant impairments as a result.
Insomnia is statistically more prevalent among females than males, often attributed to hormonal factors and higher rates of anxiety disorders.

Development & Course

The onset of insomnia can occur at any age, but it is particularly common during periods of high stress or significant life changes (e.g., job loss, bereavement).
Chronic insomnia may contribute to the development of further psychological disorders and medical conditions if not treated adequately.

Diagnostic Features

Symptoms: Individuals report nonrestorative sleep, leading to daytime fatigue and cognitive impairments such as difficulties in concentration and memory.
Associated Complaints: This disorder is often associated with anxiety, depression, and conflicts in personal and professional life due to the impaired functioning.

Diagnostic Criteria

Symptoms: Characterized by excessive sleepiness despite sufficient sleep duration, including recurrent sleep episodes and prolonged main sleep (>9 hours) that is often non-restorative.
Frequency: Symptoms must occur at least 3 times per week for a minimum of 3 months to be diagnosed.
Exclusion: Cannot be attributable to other sleep disorders (e.g., sleep apnea) or substance effects.

Prevalence

Affects about 1% of the general population, typically emerging in late adolescence or early adulthood.
More prevalent in individuals with certain psychiatric disorders, such as depression.

Diagnostic Criteria

Characterized by recurrent periods of excessive daytime sleepiness alongside episodes of cataplexy (sudden muscle weakness triggered by strong emotions) or hypocretin deficiency (an important neurotransmitter).
Tests: Diagnosis often involves polysomnography and a multiple sleep latency test to evaluate sleep patterns and latencies.

Prevalence

Narcolepsy is relatively rare, affecting approximately 0.02%-0.04% of the population.
Symptoms typically start manifesting in childhood or adolescence, leading to lifelong challenges.

Obstructive Sleep Apnea Hypopnea

Diagnosis requires evidence of apneas (temporary pauses in breathing) and hypopneas (shallow breathing) along with nocturnal breathing disturbances.
Severity: Based on the apnea/hypopnea index (AHI), which quantifies the severity and frequency of these episodes.

Types include delayed sleep phase disorder, advanced sleep phase disorder, irregular sleep-wake rhythm, non-24-hour sleep-wake syndrome, and shift work type.
Each type presents unique challenges regarding sleep timing and the ability to maintain sleep.

Non-REM Sleep Arousal Disorders

These include sleepwalking and sleep terrors, with episodes occurring during non-REM (NREM) sleep, often leading to confusion and safety risks upon awakening.

Nightmare Disorder

Characterized by repeated well-remembered dreams that cause significant distress or anxiety, often leading to difficulties returning to sleep.

REM Sleep Behavior Disorder

Involves arousal episodes with complex behaviors or actions during REM sleep, often leading to the risk of injury during episodes.

Diagnostic Criteria

Symptoms include an overwhelming urge to move the legs, typically worsened during periods of inactivity and improved through movement, especially in the evening hours.
Comorbidity: Frequently associated with other movement disorders and medical conditions, including iron deficiency anemia, diabetes, and neuropathy.

Diagnosis:

Must involve a significant sleep disturbance linked directly to substance use, which can manifest as various sleep disorders, including insomnia, excessive daytime sleepiness, or parasomnia.

Used when symptoms cause significant distress but do not meet the full criteria for any other specific sleep disorders, allowing for flexibility in diagnosis and treatment.