The regulation of awake-asleep cycles appears to involve an interplay between brain stem nuclei that use different neurotransmitters. The one that favors alertness is ________ and the other promoting deep sleep is ________.
A) acetylcholine; serotonin B) serotonin; norepinephrine C) norepinephrine; serotonin D) dopamine; GABA E) glutamate; serotonin