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Message: <blockquote data-quote="Schwepps" data-source="post: 400655" data-attributes="member: 3592">Sleepiness is usually the cause of highway crashes, especially crashes into trailers parked in the emergency lane. On a long drive, the brain goes from beta waves (alert) to alpha waves (relaxed) to theta waves (first stage of sleep) Eyelids get heavy and half close. Haven't we all felt it before - drifting into sleep for a micro-second? Happens most when driving in the after-lunch period and wee hours of the night.This drift from alpha to theta to alpha brain activity is the time when the brain is driving by focusing on a reference point, eg the lights of the vehicle ahead, not on the road surface. It drives you toward the lights, and you're not awake enough to realise that the vehicle ahead is parked in the emergency lane. This kind of accidents happen often, and mostly at night.</blockquote>