Psychophysiological insomnia: the behavioural model and a neurocognitive perspective

Area of Science:

• Neuroscience
• Sleep Medicine
• Psychology

Background:

• Discrepancies exist between subjective sleep reports and objective polysomnography (PSG) in psychophysiological insomnia.
• Patients often report being awake when PSG indicates sleep, overestimate sleep latency, and underestimate total sleep time.
• Hypnotic medications show limited impact on normalizing sleep architecture or EEG patterns.

Purpose of the Study:

• To review paradoxes in the assessment and treatment of psychophysiological insomnia and sleep state misperception.
• To introduce a novel perspective on the underlying mechanisms of these paradoxes.
• To suggest future research directions for understanding and treating insomnia.

Main Methods:

• Review of existing literature on sleep assessment and treatment paradoxes.
• Introduction of a new model based on electroencephalogram (EEG) activity.
• Discussion of potential research avenues stemming from the proposed model.

Main Results:

• Identified subjective-objective discrepancies in sleep perception and treatment efficacy.
• Highlighted that hypnotic medications do not typically normalize sleep architecture.
• Proposed that enhanced beta/gamma EEG activity at sleep onset may disrupt sleep-onset-related amnesia.

Conclusions:

• Enhanced high-frequency EEG activity may interfere with mesograde amnesia formation.
• This interference could lead to blurred phenomenological distinctions between sleep and wakefulness.
• The proposed model offers a new explanation for sleep state misperception in insomnia.