Here’s the lowdown on the best temperature for sleep, why it matters, and ways to get better rest, according to sleep experts. What is the best temperature for sleep? “The best temperature for sleep is generally thought to be at 65-67 degrees,” says Chris Winter, MD, a neurologist, sleep medicine specialist, and sleep expert at Tylenol. That said, you don't necessarily have to maintain a cool environment all day to get quality shut-eye. Then, make sure your sleep environment is cool enough by turning your thermostat down before going to bed.