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Paterson LM, Nutt DJ, Ivarsson M, Hutson PH, Wilson SJ. Effects on sleep stages and microarchitecture of caffeine and its combination with zolpidem or trazodone in healthy volunteers. J Psychopharmacol. 2009 Jul;23(5):487–94. doi: 10.1177/0269881109104852. PMID: 19351801. |