Abstract: A sleep prevention device for a driver of a vehicle including a head set with a U-shaped configuration. Also included is a mercury switch assembly with at least one mercury switch. Mercury resides within each mercury switch and closes contacts located therein upon a head of the driver tilting forward or rearwardly. Upon the closing of such and closes activation signal may be transmitted. Further provided is an alarm unit including an alarm for indicating to the driver the receipt of the activation signal. The alarm unit is connected to contacts of the mercury switches, the alarm, and a power source and further adapted to transmit an alarm signal to the alarm upon the transmission of the activation signal.