why does body heat up at night

Learn how your temperature guides you to and from dreamland each night. If youБre prone to waking up sweat-drenched (or shivering) in the middle of the night, then you know how important it is to find your temperature sweet spot for sleep. But your body temperature does more than just keep you comfortable while you snoozeБitБs actually a key part of what regulates the
that determines when your body is ready to go to sleep and when itБs ready to wake up. The 98. 6 degrees you likely think of as БnormalБ is actually just the starting point for your bodyБs internal temperature. From there, it fluctuates by a couple degrees over the course of the dayБrising about one to two degrees from early morning until late afternoon, and then reversing until it hits its lowest point a couple hours before you wake up in the morning. When your temperature is on the rise, youБre most likely to feel alert and awake; when itБs falling, youБre likely to feel drowsy. Since temperature is an such important part of determining when we fall asleep, itБs interesting that during rapid eye movement (REM) sleep, your brainБs temperature-regulating cells switch off and let your body temperature be determined by how warm or cool your bedroom is.


But that midnight chill isnБt necessarily a reason to pile on the blankets. Falling temperatures cue the onset of sleep, and may even help you sleep more soundly. In fact, wearing special clothing that lowers skin temperature by one degree Celsius can reduce middle-of-the-night arousals and early morning waking. Chances are, you donБt have special cooling pajamas to further lower your skin temperature as you sleep, but taking a bath may have a similar cooling effect. It may seem counter-intuitive, since soaking in warm water initially raises your temperature. But remember, you ultimately have to get out of the tub. Doing so sets you up for a cool-down as you dry off and the water on your skin evaporates, and that sets the stage for sleep. Try to schedule this bath for 60 to 90 minutes before bed, so that your body temperature has a chance to drop before you jump into bed and pile on those cozy blankets.


Otherwise, you might be to rest comfortably! And when you need help waking up in the morning (or you need to get out of an afternoon slump), consider doing some jumping jacks in place or going for a brisk walk to elevate your body tempБand your energy level. Heart Rate, Blood Pressure, and Blood Flow Just like breathing, your and are different during sleep. And they change depending on what phase of sleep youБre in. Heart rate and blood pressure go down and are steadier during non-REM sleep. During REM sleep, they rise and are more varied, similar to daytime patterns. Changes in flow during this sleep period can also cause sexual responses (erections in men and an engorged clitoris in women). As daybreak approaches, both heart rate and blood pressure inch back up. You chance of having a is higher at this time. ItБs basically naptime for the nerve cells in your as you dip into non-REM sleep. They do send out a few messages, but nothing much. But like so many other bodily functions, activity goes up during REM sleep, sometimes even more than during the day.


Blood flow to the and the in your also go up during REM sleep. During sleep, the brain limits physical movement. It keeps you from acting out on your. Flailing your arms and legs around while youБre sleeping could be dangerous. Your brain also uses your sleep cycles to consolidate memories. So staying up all night to cram for a test might be counterproductive. Your body is busy repairing cells and finishing digestion. During a good nightБs rest, you may not get up to go to the bathroom. ThatБs because your make less pee while you sleep. Growth hormone production surges. Your body makes more hormones. Levels of, sometimes called the Б hormone,Б go down when you first fall asleep, then go up again right before you wake up. Levels of, one of the main chemicals involved in the sleep-wake cycle, do just the opposite: they rise to make you sleepy when the sun sets and ebb at daylight. б 2016 WebMD, LLC. All rights reserved.

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