If nights feel warmer than they should, it’s tempting to blame the whole bed. New sheets. New mattress. New everything. But in a lot of rooms, the heat problem starts at the top, right where your head rests for hours. A cushion that holds warmth can make your face feel hot, your neck damp, and your sleep choppy, even when the thermostat is fine. The smartest fix is often the simplest: change the one item that touches you all night.