Only if the mask is made for overnight wear. Clay and wash-off masks should be removed on time. Volcano Mask, for example, stays on for up to 10 minutes, because clay left on for hours can over-dry skin. Leave-on sleeping masks are a different category.
Omega Overnight Sculpting Mask is designed to stay on from bedtime until morning as the last step of your routine. If you use a retinoid such as Retinu, apply it first and let the mask go on top. The mask contains essential oils, so if your skin reacts easily, patch test on your jawline first and start with three nights a week. Rinse in the morning and apply sunscreen.
