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I hit this page from Special:Random and just happened to want to Google things... I found a pdf document that describes this technique very succinctly, and it references another work:
Porkka-Heiskanen, T. and Tuornisto, L. and Yilnen, M. and Stenberg D. "The effect of REM sleep deprivation on histamine concentration in different brain areas." Live Sciences 54 (2): 1720-25, 1994.
The PDF document that I found is:
Hale SAYAN and Ethem GELİR and Aydan BABÜL, "Brain Stem and Cerebral Cortex Histamine Concentrations in the Rem Sleep Deprived Rats", Turk. J. Med. Sci., 31 (2001) 499-502