There is conflicting evidence for the role of nicotine in sleep regula
tion. This study was undertaken to determine the effects of transderma
l nicotine at doses of 17.5, 35 and 52.5 mg on sleep and PGO spike act
ivity. Minor effects were observed on sleep with a general increase in
waking. PGO spike activity was abolished by all patches. The results
are discussed in terms of the mechanisms involved in the disappearance
of PGO spikes as a result of nicotine.