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After absorption their action, speaking generally, is exerted on the brain and spinal cord, and is at first slightly stimulant and afterwards depressing, even to the causing of sleepiness and stupor.
Falling asleep at the wheel is increasingly preceded by feelings of increasing sleepiness.
This test assesses daytime sleepiness and narcolepsy.
Vehicle devices to detect fatigue are far less reliable than a driver's own self-awareness of sleepiness.
It is designed to provide as good a pain relief as possible without causing undue sleepiness.
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