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Bhatti et al1 recently examined the impact of chronotype on melatonin levels in shift-workers and concluded that ‘(…) morning type shift-workers were better able to maintain normal patterns of melatonin secretion (…), suggesting that morning types may be protected against the negative effects of shift-work related melatonin disruption’. However, their data show that, compared to daytime workers sleeping at night, early chronotypes have lower melatonin …
Contributors CV wrote the first draft of the letter and ESS and CV both further edited it.
Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.
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