nodding

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A brief episode of sleep of precipitous onset, lasting from a fraction of a second to 30 seconds. It occurs in night-shift fatigue, and is associated with excess daytime sleepiness and automatic behaviour
Aetiology Sleep deprivation, mental fatigue, sleep apnea, hypoxia, narcolepsy, or hypersomnia
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

nodding

(nŏd′ĭng)
Involuntary motion of the head downward, as when momentarily dozing.
Medical Dictionary, © 2009 Farlex and Partners