Important aspects of driving impairment associated with sleepiness are reaction time, vigilance, attention, and information processing. The exact prevalence is not known in Singapore. Sleepiness-related crashes is an under-recognised problem and may be categorised as fatigue and inattention.
Although society today gives sleep less priority than other activities, sleepiness and performance impairment are responses of the human brain to sleep loss/ deprivation. There is currently nothing that can reduce the human need for sleep. Microsleeps, or involuntary intrusions of sleep or near-sleep, can overcome even the best intentions to remain awake.
A typical crash related to sleepiness has the following characteristics:
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