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Are decreased melatonin levels related to having more nightmares? - melatonin more drug_warnings_recalls

Yes, according to
Brismar K. Mogensen L. Wetterberg L. Melatonin secretion in depressed patients with nightmares due to beta-blockers. _Acta Medica Scandinavica_. 221 (2) :155-8, 1987.
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