Why does my pillow sleep hot?

Solid memory foam is the biggest culprit it traps body heat in its dense structure. Solutions: choose shredded foam (air circulates between pieces), gel infused foam (absorbs heat), ventilated foam (holes for airflow), or materials like latex, buckwheat, or Purple Grid. Pillow covers made from bamboo, Tencel, or cooling fabrics also help. Avoid polyester covers, which trap heat.