Abstract: A therapeutic sleep device worn about an individual's torso and intended to discourage an individual from sleeping in a supine position includes a body securing member and a sleep fin. The body securing member has an interior side and a posterior side. The sleep fin includes a supine-suppression fin providing a right convex surface and a left convex surface tapering from a wider base region to a narrower peak region at which the right and left convex surfaces join at an apex. The apex and at least a portion of the right and left convex surfaces extend beyond said posterior side of the body securing member. A spine indentation formed in the sleep device can help to increase the comfort and improve the securing of the device to a individual.