Yankee Candle Sleep Diffuser and Sleep Fragrances create the perfect environment for great sleep. Insert the specially formulated mess-free refill into the Sleep Diffuser and enjoy 30 nights of relaxing fragrance*—there’s no water to add! Set the diffuser’s timer for 2, 4, or 8 hours of soothing ambiance, at the fragrance intensity you find the most restful. The Silver Sleep Diffuser Kit includes a Midnight Tranquility fragrance refill to get you started. Sleep Diffuser refills are available in 4 relaxing fragrances and are blended with essential oils. Sleep good, feel good with the new Yankee Candle Sleep Diffuser! *Based on 8 hours of nightly use on lowest intensity setting.