why does my body feel hot at night

Bushfires are quite appropriately dominating our nationБs concerns during the current Australian heatwave. But for many, the struggle to sleep through soaring temperatures is a personal inferno that dominates conversation around offices and homes across the country. Sleep and body control of temperature ( ) are intimately connected. Core body temperature follows a 24-hour cycle linked with the sleep-wake rhythm. Body temperature decreases during the night-time sleep phase and rises during the wake phase. Sleep is most likely to occur when core temperature decreases, and much less likely to occur during the rises. Our hands and feet play a key role in facilitating sleep as they permit the heated blood from the central body to lose heat to the environment through the skin surface. The sleep hormone melatonin plays an important part of the complex loss of heat through the peripheral parts of the body. At sleep onset, core body temperature falls but peripheral skin temperature rises. But temperature changes become more complex during sleep as our temperature self-regulation varies according to sleep stage. has shown how environmental heat can disturb this delicate balance between sleep and body temperature.


An ambient temperature of 22к or 23к Celsius is ideal. Any major variation in this leads to disturbance of sleep with reduced slow wave sleep (a stage of sleep where the brainБs electrical wave activity slows and the brain БrestsБ), and also results in less dreaming sleep (rapid eye movement or REM sleep). Indeed during REM sleep, our ability to regulate body temperature is impaired so in a clever sort of way the body БavoidsБ this stage of sleep during extreme cold or heat. A heat wave may cause several nights of fragmented sleep with less slow wave and REM sleep. This will certainly cause a correct perception of bad, restless sleep with consequent negative effects on mood and alertness. In theory, it may also have subtle effects such as problems with complex memory retention, higher judgement (poorer decision making and increased risk-taking behaviour), blood pressure control and regulation of glucose in the body.


The clear message is this: if youБre going to make some big decisions during a heatwave, sleep in a carefully controlled air-conditioned environment. But apart from air-conditioning, what can you do to sleep better during a heatwave? Sleeping in the lateral position (on your side) with less contact with the mattress may be good but the body tends to do this anyway during sleep, in response to rising temperatures. Cooling the central body with a wet cloth or towel makes sense. A cool shower may also help. It is important to avoid doing anything too strenuous in the hours before bed-time as this will make it harder for the body temperature to fall during sleep. And when you wake up hot, sticky and irritated because you donБt have air-conditioning or believe such devices are environmentally unsound, remember those fighting bushfires - it could be a lot worse.
Doctors often hear their patients complain of. Night sweats refer to excess during the night. But if your bedroom is unusually hot or you are wearing too many bedclothes, you may sweat during, and this is normal.


True night sweats are severe occurring at night that can drench your clothes and sheets and that are not related to an overheated environment. It is important to note that flushing (a warmth and redness of the face or body) may be hard to distinguish from true night sweats. There are many different causes of night sweats. To find the cause, a doctor must get a detailed medical history and order tests to decide if another medical condition is responsible for the night sweats. Some of the known conditions that can cause night sweats are:. The hot flashes that accompany can occur at night and cause sweating. This is a very common cause of night sweats in women. Idiopathic. Idiopathic is a condition in which the body chronically produces too much sweat without any identifiable medical cause. Infections. is the infection most commonly associated with night sweats. But, such as endocarditis (inflammation of the valves), (inflammation in the bones), and abscesses can cause night sweats. Night sweats are also a symptom of infection.


Cancers. Night sweats are an early symptom of some cancers. The most common type of associated with night sweats is. However, people who have an undiagnosed frequently have other symptoms as well, such as unexplained and. Taking certain medications can lead to night sweats. medications are a common type of drug that can lead to night sweats. From 8% to 22% of people taking drugs have night sweats. Other psychiatric drugs have also been associated with night sweats. Medicines taken to lower fever, such as and, can sometimes lead to sweating. Many other drugs can cause night sweats or flushing. can cause sweating. People who are taking or oral medications may have hypoglycemia at night that is accompanied by sweating. Hormone disorders. Sweating or flushing can be seen with several hormone disorders, including pheochromocytoma, and. Neurologic conditions. Uncommonly, neurologic conditions including autonomic dysreflexia, posttraumatic, and may cause increased sweating and may lead to night sweats. В1996-2008 MedicineNet, Inc. All rights reserved.

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