Sleep, Dream, Rejuvenate. SnoozZy's adjustable cotton sleep mask will cocoon you in a soft embrace so you can enjoy lights out, whatever the time of day. SnoozZy's adjustable 100% cotton sleep mask. Sleep masks are a great way to block out light and improve the quality of your sleep, whether it's daytime or night time. They can be especially useful for people who work night shifts or have trouble sleeping in well-lit environments.