The Hot Sleeper Epidemic   Approximately 40% of Americans report sleeping hot, experiencing night sweats, excessive warmth, and disrupted sleep that reduces quality of life and next-day functioning. The mattress you sleep on dramatically impacts temperature regulation—traditional memory foam can trap heat while advanced cooling technologies actively dissipate it.   This comprehensive guide explores the science of sleep temperature, compares cooling technologies, recommends top cooling mattresses verified by thermal testing, and provides strategies for creating the optimal cool sleep environment.