Disorders of Sleep

Introduction to Sleep Disorders

  • Overview of various disorders affecting sleep.

  • Importance of diagnosing sleep-related issues when they impact daily life.

Insomnia

  • Definition: A disorder characterized by difficulty falling or staying asleep.

  • Diagnosis Criteria: Persistent sleep problems for at least three months, with difficulty falling asleep for at least 30 minutes.

Types of Insomnia

  • Onset Insomnia:

    • Characterized by difficulty falling asleep initially at the beginning of the sleep cycle.

  • Maintenance Insomnia:

    • Refers to difficulties in staying asleep, notably waking up in the middle of the night and unable to return to sleep for at least 30 minutes.

  • Terminal Insomnia:

    • Involves waking up too early, sometimes hours before the intended wake time.

Classification of Insomnia

  • Primary Insomnia:

    • Caused by internal psychological factors such as anxiety or worry disrupting sleep.

  • Secondary Insomnia:

    • Resulting from external factors or conditions, e.g., substance abuse or chronic pain (e.g., back pain).

Abnormal Dreaming

  • Discusses phenomena like nightmares and night terrors.

Nightmares

  • Definition: Dreams with negative emotional content occurring during REM sleep.

  • Commonality: Many individuals experience nightmares; theorized as an evolutionary mechanism to prepare for threats.

  • REM Sleep: Involves vivid dreaming and is identifiable when individuals can recount dreams after being awoken during this state.

Night Terrors

  • Definition: Episodes of intense panic upon waking, typically without accompanying dream content.

  • Occurrence: Happens during non-REM sleep; associated with physical arousal but not narrative dreams.

  • Common Triggers: Increased stress levels can lead to more frequent occurrences.

Movement Disorders

  • Disorders affecting sleep quality due to physical movement.

Restless Leg Syndrome

  • Symptoms: Persistent discomfort causing individuals to constantly adjust leg positioning; may affect sleep quality.

  • Awareness: Individuals might not realize it disrupts their sleep.

REM Behavior Disorder

  • Definition: Condition where individuals physically act out their dreams due to lacking the muscle paralysis that occurs in REM sleep.

  • Risks: Potential for injury to oneself or a partner during sleep; problematic behaviors can be dangerous.

Sleepwalking (Somnambulism)

  • Definition: Occurs when individuals perform simple, routine actions while still asleep.

  • Characteristics: Individuals show no recall of dream content post awakening; typically safer to wake them up than to let them wander.

  • Common Behaviors: Engaging in familiar activities such as getting cereal for breakfast without conscious awareness.

Breathing Disorders

  • Disorders related to interrupted breathing during sleep.

Sleep Apnea

  • Definition: A disorder where airways become obstructed, leading to interrupted breathing.

  • Common Associations: More prevalent in obese individuals or those with brain injuries affecting the medulla.

  • Physiological Response: Decreased oxygen leads to a natural gasping reflex that can wake individuals, often without them realizing the wakefulness.

  • Treatment Options: Weight loss or use of a breathing machine in severe cases to keep airways open.

Additional Sleep Disorders

  • Overview of disorders that affect sleep control.

Narcolepsy

  • Definition: A condition causing spontaneous bouts of sleep unrelated to drowsiness or prior sleep.

  • Characteristics of Sleep Episodes: May last seconds to a couple of minutes; often enters directly into REM sleep.

  • Safety Concerns: Risks associated with unexpected sleep episodes, particularly in activities like driving.

  • Common Treatment Approaches: Prescribed medications and scheduled naps to manage episodes.

  • Non-Human Examples: Animals such as dogs also experience narcolepsy, depicted in videos where they suddenly fall asleep during activities like chasing butterflies.