If you like when the temperature of your bedroom is warm, this can be a bad habit. A cool room temperature is one of the most important factors in getting a good night’s sleep, researchers say.The best bedroom temperature is approximately 65°F (18.3°C). But doctors recommend keeping it between 60°F to 67°F (15.5°C to 19.4°C), depending on what’s more comfortable for you. This is because the body is programmed to lower its temperature in the evening. If you set your radiator on a cooler mode, it works as a signal to your body that it’s time to sleep.