Does this mattress sleep hot?

No, it runs cooler than most plush beds despite the soft Euro-top, scoring 8.7 for cooling. Peak surface temperature holds in the 29 to 32 C range. The cooling is structural rather than gimmicked: a breathable comfort foam lets heat escape, and the 800-coil pocketed core circulates a column of air that a solid foam slab cannot. There is no dedicated cooling cover, so airflow comes from the build itself.