Sleep glossary
blackout
Updated
It can refer to curtains, blinds, tape, or sleep masks, but fit usually decides how effective it feels.
Plain-English definition
Blackout describes blocking or reducing unwanted light in a room or around the eyes.
It can refer to curtains, blinds, tape, or sleep masks, but fit usually decides how effective it feels.
Why it matters
Small light leaks can matter more than the word blackout on the packaging.
Buying relevance
Use this term as a practical buying clue, then check the current manufacturer wording, setup guidance, materials, and returns policy. It should not be treated as a medical claim or a guarantee of how a product will work for you.
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