Causal Relationship Between Sleep Characteristics and Alopecia Areata and Other Non-Scarring Alopecia: A Two-Sample Bidirectional Mendelian Randomization Analysis.

Causal Effect of Sleep Characteristics on Alopecia In the forward MR analysis ( Table 1 ), the IVW method indicated that the genetically predicted insomnia had a nominally significant causal effect on alopecia areata (OR (95% CI) = 3.88 (1.5–10.04), P = 0.01), indicating that insomnia is linked to a higher risk of alopecia areata.

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