Mattress & Sleep Glossary
Plain-English definitions for every mattress, pillow, and sleep-science term. Coil gauge, ILD, GOLS, sleep latency — by Sleep Sage engineers.
Mattress & Sleep Glossary from Sleep Sage's independent testing team. Every recommendation on this page was earned through measured performance — not paid placement.
What you'll find on this page about glossary: lab-measured scores, hands-on testing notes, our recommended buyer profile, current pricing intelligence, and a clear verdict from the Sleep Sage editorial team. Page last reviewed August 2026.
Plain-English definitions for every mattress, pillow, and sleep-science term. Coil gauge, ILD, GOLS, sleep latency — by Sleep Sage engineers.