[Implication of hypothalamic structures in indolaminergic mechanisms of paradoxical sleep]

Intratissue injection of 1 to 20 micrograms of L-5 HTP in numerous areas of the cat brainstem failed to reverse P-chlorophenylalanine induced insomnia. On the other hand, injection of 2 to 7 micrograms of L-5 HTP in the ventrolateral hypothalamus induced both slow wave sleep and paradoxical sleep after 36 and 76 min.