I'm asking because this is something that happened to me for the first time this year (a few weeks ago, when the EU "heatwave" reached its peak pretty much all around. We had peaks of 45C "felt" temperature where I live), and it was the weirdest thing. Usually when I lay in bed the sheets are always cooler than my skin, sometimes you roll around in them in search for some of that quickly disappearing coolness. That time instead, I laid in bed and I felt like I was going to cook. The whole bed was warmer than my skin, despite the fan pointed on it and on me. Rolling around was pointless, both sides of the pillow were warm against my head. Really a weird experience.