wakefulness human 32 REM sleep 22 male 22 physiology 22 priority journal 22 Male 20 Animals 18 Article 18 Humans 18 Wakefulness 18 nonhuman 18 Electroencephalography 14 animal 14 article 14 consciousness 14 electroencephalogram 14 electroencephalography 14 Brain 12 Sleep, REM 12 animal experiment 12 controlled study 12 pedunculopontine tegmental nucleus 12 Sleep 10 calcium channel N type 10 calcium channel P type 10 calcium channel Q type 10 female 10 gamma rhythm 10 schizophrenia 10