If you find yourself turning your pillow multiple times at night to find the coolest side, this may be a sign you’re a warm sleeper. Warm sleepers benefit from pillows that have high airflow through them. This includes channels specifically carved through the pillowcase to encourage air travel and cooler sleep. If you sleep warm, consider a cooling gel pillow with air pockets, or using a pillowcase with etched channels. These are specifically engineered to keep you cool while sleeping.