Is your bedroom really hot? If it is, it may be affecting your memory and other thinking skills. Heat waves sometimes kill people who are very old, very young or in poor health. But new research shows that sleeping in a hot room can affect the thinking ability of even healthy young adults. This finding comes from Harvard University's T.H. Chan School of Public Health. Researchers there looked at 24 students before, during and after a Boston-area heat wave. Of the 24 students, four slept in rooms with air-conditioning, also called “AC” for short. And 20 slept in rooms without AC. The experiment lasted 12 days. The temperature of the room without air conditioning, or AC, averaged 26 degrees Celsius. The temperature in the rooms with AC averaged 21 degrees Celsius. Jose Guillermo Cedeno-Laurent led the study. He is a professor and researcher at Harvard’s School of Public Health.