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pubmed:abstractText |
Sleep was induced in chicks aged 4-7 days by intravenous injection of clonidine hydrochloride 0.04 mumol/kg. Sleep was not prevented or altered by a preceding intramuscular injection of blockers of histamine H2-receptors which were used in doses (as mumol/kg) of up to 800 (metiamide) and 2400 (cimetidine). Clonidine, therefore, does not cause sleep by stimulating H2-receptors in the brain. The highest dose of cimetidine used had a hypnotic action of its own.
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