This is the study?
J Int Soc Sports Nutr. 2007 Oct 23;4(1):14 [Epub ahead of print] Links
Effects of a single dose of N-Acetyl-5-methoxytryptamine (Melatonin) and resistance exercise on the growth hormone/IGF-1 axis in young males and females.
Nassar E, Mulligan C, Taylor L, Kerksick C...