| DAY 5 OF 12 Check the Temperature Are you a cold or hot sleeper? Think back to times you've had trouble sleeping because of the temperature in your room. According to one study, this can be one of the biggest sleep disruptors (1). Body temperature follows circadian rhythm. It tends to fall near bedtime and rise again in the morning. The ability to regulate body temperature is known as thermoregulation (2). Your body's ability to thermoregulate varies during sleep, but doesn't work as well when you're in the REM cycle of sleep. If your bedroom is too cold or too hot, it disrupts your body's temperature, disturbing your sleep. Humidity and heat can make it hard to fall and stay asleep. Colder temperatures can cause you to toss and turn, too. Of course, everyone's body differs, but the ideal sleeping temperature is 65°F (18.3°C). For today's challenge: If your body is more sensitive to cold temperatures, invest in some warm pajamas and a cozy blanket. If there isn't enough heat in your room, consider taking a warm bath or shower before bed. The cooldown after a warm bath can help you sleep. If your body can't stand heat, sleep with the window open or turn on a fan. You might also consider sleeping with lighter clothing, or even naked. It's one way to cool down your body, which can help improve sleep quality. Upgrading your bedding with cooling comforters may also help. We'll be back tomorrow to talk about setting yourself up for success. The Healthline Team | 
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