Psychological Determinants of Sleep Paralysis: A Contemporary Review of Anxiety, Stress, and Trauma

Sleep paralysis is a distressing condition where people are temporarily unable to move during transitions between sleep and wakefulness, often accompanied by intense fear and hallucinations. This review of recent literature shows that anxiety is strongly linked to more frequent episodes, greater fear, and sleep-related distress. Chronic stress disrupts sleep and increases vulnerability to these episodes. Trauma exposure, especially early-life or unresolved trauma, is consistently associated with more severe experiences, including vivid hallucinations and prolonged paralysis. When anxiety, stress, and trauma occur together, they produce a cumulative effect leading to greater episode severity and recurrence. These findings support a biopsychosocial model and highlight the need for psychological and trauma-informed approaches in treatment.

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Abstract

Sleep paralysis is a distressing parasomnia marked by temporary immobility during sleep–wake transitions, often accompanied by intense fear and hallucinatory experiences. While traditionally explained through neurophysiological mechanisms, this contemporary review highlights the significant role of psychological factors in shaping both the onset and experience of sleep paralysis episodes. Analysis of recent literature reveals that anxiety is strongly associated with increased episode frequency, heightened fear responses, and anticipatory sleep-related distress. Chronic stress emerges as a key precipitating factor by disrupting sleep continuity and increasing vulnerability to dissociative sleep states. Trauma exposure, particularly unresolved or early-life trauma, is consistently linked to more severe subjective experiences, including vivid fear-based hallucinations, prolonged episodes, and heightened emotional distress. The combined presence of anxiety, stress, and trauma produces a cumulative effect, resulting in greater episode severity and recurrence. These findings support a biopsychosocial understanding of sleep paralysis and underscore the importance of integrating psychological and trauma-informed approaches in assessment and intervention strategies.