Megan R. Gunnar, Stephen Malone, Gail Vance, Robert O. Fisch, Coping with Aversive Stimulation in the Neonatal Period: Quiet Sleep and Plasma Cortisol Levels during Recovery from Circumcision, Child Development, Vol. 56, No. 4 (Aug., 1985), pp. 824-834
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Gunnar et al. (1985) studied this question.