How does the onset of sleepiness or drowsiness influence the behavior of the driver?

Question

DentroTest · Accepted Answer

Drowsiness is a very serious psychophysical risk factor in driving. When a person drives while sleepy, their cognitive and psychomotor functions deteriorate: body movements and the execution of maneuvers are much slower, clumsier and less precise, and reaction time also increases markedly. The other two ideas are false: when sleepy, the likelihood of being distracted does not decrease but increases greatly, because it is hard to keep attention, and the traffic environment is not perceived better either, but worse, both by sight and by hearing.

How does the onset of sleepiness or drowsiness influence the behavior of the driver?

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