The Intersection of Sleep and Hair Loss: A Systematic Review.

Area of Science:

• Dermatology and Sleep Medicine
• Investigates the intersection of sleep quality and hair health.
• Focuses on dermatologic conditions and their impact on sleep.

Background:

• Sleep disturbance is an understudied factor in hair loss disorders like alopecia areata (AA), androgenetic alopecia (AGA), and telogen effluvium (TE).
• These hair loss conditions have significant psychosocial impacts and involve pathways affected by sleep.
• Understanding the sleep-hair loss connection is crucial for comprehensive patient care.

Purpose of the Study:

• To systematically review studies on sleep disturbances and major hair loss subtypes.
• To identify shared and specific mechanisms linking sleep and hair loss.
• To provide insights for clinical management and patient counseling.

Main Methods:

• A PRISMA-guided systematic review of PubMed and Scopus.
• Included 29 studies after screening 291 identified articles.
• Data extracted on study design, hair loss type, sleep measures, mechanisms, and psychosocial factors.

Main Results:

• Low to moderate evidence quality, predominantly cross-sectional studies.
• Sleep disturbance was elevated in AA, AGA, TE, and LPP.
• Mechanisms varied by subtype, involving cytokines, HPA axis, clock genes, circadian rhythms, hypoxia, and neuroinflammation.
• Psychosocial distress exacerbated sleep disruption across most subtypes.

Conclusions:

• Sleep disturbance is a relevant factor in hair loss disorders, with plausible biological links.
• Evidence suggests a bidirectional relationship between sleep quality and hair loss.
• Integrating sleep assessments and interventions may enhance hair loss management and patient outcomes.