Gender difference and laterality of sleep position

Body position and the number of position shifts during sleep differ substantially between individuals. There is no gender difference in the frequency of position shifts. Although the supine type is more common than the lateral type, there is no gender difference in sleep position. Therefore, the reason of higher incidence in women is not related to sleep. The right-dominant type occurs more than the left-dominant type in both genders. It is possible that this behavior is the reason for the predominant involvement of the right ear in BPPV.