Numbuzin No. 6 Deep Sleep Mask Serum is designed to be used in your evening routine. Numbuzin No. 6 Deep Sleep Mask Serum restores radiance to dull skin with a high-concentration formula of Icelandic glacier water to keep your skin moisturised and a hyaluronic acid complex to deliver intense hydration to the skin. Wake up with that coveted glow by applying two to three pumps to your face before bedtime.