Abstract: A device for preventing snoring of a sleeping person comprises an arrangement (5-9) for detecting snoring sounds and an apparatus (17) controlled by this arrangement and adapted to influence the person to stop snoring. The arrangement has a sound-receiving microphone (5) and at least one frequency filter (6, 8), arranged to deliver signals deriving from sounds with frequencies typical for snoring sounds in order to determine if the present sound derives from snores. The arrangement further comprises a circuit (10-14) for determining if the signals delivered by the microphone are periodically appearing at time intervals, which are typical for snores. The circuit comprises a counter (13) which is arranged to count the number of snores. The arrangement (5-14) of the device is adapted to send activating control pulses to the apparatus when the counter (13) has detected a predetermined number of successive snores with the time intervals.