29 Another study in the same population reported a borderline significant increase in headache after three consecutive night shifts compared with two consecutive night shifts, but also that longer sleep duration could protect against this effect. 30 Longitudinal studies with 2‐ and 3‐year follow‐ups have yielded mixed results: a Danish population‐based study of 2952 public employees (municipality or hospital) found higher odds of nonspecific headache or migraine among shift workers compared with permanent day workers after 2 years when adjusting for headache/migraine at baseline.
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The acute effect of night work-related circadian misalignment on headache episodes: Results from the 1001 nights-cohort.
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