question: Why do people get so hot and sweaty in their sleep?
comment: A possibility is medications, or the lack of a needed medication. For example, women going through menopause get night sweats due to the lack of estrogen. Hormone replacement therapy (HRT) usually corrects that. The same for men and testosterone replacement (TRT). Once the proper level of testosterone is reached, the sweats usually stop.
passages: While night sweats might be relatively harmless, it can also be a sign of a serious underlying disease. It is important to distinguish night sweats due to medical causes from those that occur simply because the sleep environment is too warm, either because the bedroom is unusually hot or because there are too many covers on the bed. Night sweats caused by a medical condition or infection can be described as "severe hot flashes occurring at night that can drench sleepwear and sheets, which are not related to the environment". Some of the underlying medical conditions and infections that cause these severe night sweats can be life-threatening and should promptly be investigated by a medical practitioner.
   Night sweats
  
  Night sweats is the occurrence of excessive sweating during sleep. The person may or may not also perspire excessively while awake.
  
  One of the most common causes of night sweats in women over 40 is the hormonal changes related to menopause and perimenopause. This is a very common occurrence during the menopausal transition years.
   While night sweats might be relatively harmless, it can also be a sign of a serious underlying disease. It is important to distinguish night sweats due to medical causes from those that occur simply because the sleep environment is too warm, either because the bedroom is unusually hot or because there are too many covers on the bed. Night sweats caused by a medical condition or infection can be described as "severe hot flashes occurring at night that can drench sleepwear and sheets, which are not related to the environment". Some of the underlying medical conditions and infections that cause these severe night sweats can be life-threatening and should promptly be investigated by a medical practitioner.
   Section::::Title.
   Section::::Associated conditions.
  
  The condition may be a sign of various disease states, including but not exclusive to the following:
  
  BULLET::::- Cancers
  
  BULLET::::- Lymphoma
  
  BULLET::::- Leukemia
  
  BULLET::::- Infections
  
  BULLET::::- HIV/AIDS
  
  BULLET::::- Tuberculosis
  
  BULLET::::- Mycobacterium avium-intracellulare infection
  
  BULLET::::- Infectious mononucleosis
  
  BULLET::::- Fungal infections (histoplasmosis, coccidioidomycosis)
  
  BULLET::::- Lung abscess
  
  BULLET::::- Infective endocarditis
  
  BULLET::::- Brucellosis
  
  BULLET::::- Pneumocystis pneumonia (most often - in immunocompromised individuals)
  
  BULLET::::- Endocrine disorders
  
  BULLET::::- Menopause
  
  BULLET::::- Premature ovarian failure
  
  BULLET::::- Hyperthyroidism
  
  BULLET::::- Diabetes mellitus (nocturnal hypoglycemia)
  
  BULLET::::- Endocrine tumors (pheochromocytoma, carcinoid)
  
  BULLET::::- Orchiectomy
  
  BULLET::::- Rheumatic disorders
  
  BULLET::::- Takayasu's arteritis
  
  BULLET::::- Temporal arteritis
  
  BULLET::::- Other
  
  BULLET::::- Obstructive sleep apnea
   A treatment modality is clipping of the sympathetic nerve at the level of T4 by thoracoscopic means.
  
  Section::::Causes.:Night sweats.
  
  Night sweats, also known as nocturnal hyperhidrosis, is the occurrence of excessive sweating during sleep. The person may or may not also perspire excessively while awake.
  
  One of the most common causes of night sweats in women over 40 is the hormonal changes related to menopause and perimenopause. This is a very common occurrence during the menopausal transition years.
   Wearing more clothing slows daily temperature change and raises body temperature. Similarly, sleeping with an electric blanket raises the body temperature at night.
  
  Sleep disturbances also affect temperatures. Normally, body temperature drops significantly at a person's normal bedtime and throughout the night. Short-term sleep deprivation produces a higher temperature at night than normal, but long-term sleep deprivation appears to reduce temperatures. Insomnia and poor sleep quality are associated with smaller and later drops in body temperature. Similarly, waking up unusually early, sleeping in, jet lag and changes to shift work schedules may affect body temperature.
  
  Section::::Concepts.
  
  Section::::Concepts.:Fever.
   Homeostatic functions, especially thermoregulation, occur normally during non-REM sleep, but not during REM sleep. Thus, during REM sleep, body temperature tends to drift away from its mean level, and during non-REM sleep, to return to normal. Alternation between the stages therefore maintains body temperature within an acceptable range.
  
  In humans the transition between non-REM and REM is abrupt; in other animals, less so.
   The title arises from the operation of somec, the life extension drug forming the foundation of the interstellar Empire. Somec creates an unbearable, torturous burning sensation throughout the body while pushing the patient to suspended animation. However, the somec process exterminates the user's memory, and so these memories are recorded and stored separately shortly before they go under, to be returned to the body after they have awakened, and so the memory of the process itself cannot be retained. Thus, each somec patient experiences the panic of burning hot sleep "for the first time" (as far as their memory goes) no matter how many times they have taken somec before.
   BULLET::::- Eccrine sweat glands under the skin secrete sweat (a fluid containing mostly water with some dissolved ions), which travels up the sweat duct, through the sweat pore and onto the surface of the skin. This causes heat loss via evaporative cooling; however, a lot of essential water is lost.
   Severe hot flashes can make it difficult to get a full night's sleep (often characterized as insomnia), which in turn can affect mood, impair concentration, and cause other physical problems. When hot flashes occur at night, they are called "night sweats". As estrogen is typically lowest at night, some women get night sweats without having any hot flashes during the daytime.
  
  Section::::Signs and symptoms.:Young women.
   Section::::Biology.
  
  Mammals attempt to maintain a comfortable body temperature under various conditions by thermoregulation, part of mammalian homeostasis. The lowest normal temperature of a mammal, the basal body temperature, is achieved during sleep. In women, it is affected by ovulation, causing a biphasic pattern which may be used as a component of fertility awareness.
  
  In humans, the hypothalamus regulates metabolism, and hence the basal metabolic rate. Amongst its functions is the regulation of body temperature. The core body temperature is also one of the classic phase markers for measuring the timing of an individual's Circadian rhythm.
   Section::::In cold conditions.
  
  BULLET::::- Heat is lost mainly through the hands and feet.
  
  BULLET::::- Sweat production is decreased.
  
  BULLET::::- The minute muscles under the surface of the skin called arrector pili muscles (attached to an individual hair follicle) contract (piloerection), lifting the hair follicle upright. This makes the hairs stand on end, which acts as an insulating layer, trapping heat. This is what also causes goose bumps since humans do not have very much hair and the contracted muscles can easily be seen.
   According to a BBC experiment conducted by researchers at Oxford University, counting sheep is actually an inferior means of inducing sleep.
  
  Section::::Activities.:Hot bath.
  
  The daily sleep/wake cycle is linked to the daily body temperature cycle. For this reason, a hot bath which raises the core body temperature has been found to improve the duration and quality of sleep. A 30-minute soak in a bath of  – which raises the core body temperature by one degree – is suitable for this purpose.
   Section::::Recording and production.
   Other factors that influence the clothing insulation are posture and activity. Sitting or lying change the thermal insulation due to the compression of air layers in the clothing, but at the same time - depending on the materials that are made of - chairs and bedding can provide considerable insulation. While it is possible to determine the increase of insulation provided by chairs, sleeping or resting situations are more difficult to evaluate unless the individual is completely immobile.
   BULLET::::- Heat is lost from the heater while charging overnight. The room is warm in the morning, but this is because it has wastefully been heated all night.
   Meanwhile, Wentz began to publicize the band wherever possible, from wearing "Panic! at the Disco" T-shirts onstage to mentioning them in interviews. Wentz gave a quick mention to the band during a press junket on the day before the 2005 MTV Video Music Awards: "I've got a couple of bands coming out soon on Decaydance, one being this band called Panic! at the Disco," Wentz said. "Their record is going to be your next favorite record. It's called "A Fever You Can't Sweat Out" — get it before your little brother does." At the time of their signing, all of the band members were still in high school, with the exception of Ross, who was forced to leave the University of Nevada, Las Vegas.
   Reported values vary depending on how it is measured: oral (under the tongue): (), internal (rectal, vaginal): . A rectal or vaginal measurement taken directly inside the body cavity is typically slightly higher than oral measurement, and oral measurement is somewhat higher than skin measurement. Other places, such as under the arm or in the ear, produce different typical temperatures. While some people think of these averages as representing normal or ideal measurements, a wide range of temperatures has been found in healthy people. The body temperature of a healthy person varies during the day by about with lower temperatures in the morning and higher temperatures in the late afternoon and evening, as the body's needs and activities change. Other circumstances also affect the body's temperature. The core body temperature of an individual tends to have the lowest value in the second half of the sleep cycle; the lowest point, called the nadir, is one of the primary markers for circadian rhythms. The body temperature also changes when a person is hungry, sleepy, sick, or cold.
   Section::::Composition.
   Basal body temperature is the lowest temperature attained by the body during rest (usually during sleep). It is generally measured immediately after awakening and before any physical activity has been undertaken, although the temperature measured at that time is somewhat higher than the true basal body temperature. In women, temperature differs at various points in the menstrual cycle, and this can be used in the long term to track ovulation both for the purpose of aiding conception or avoiding pregnancy. This process is called fertility awareness.
  
  Section::::Concepts.:Core temperature.
   Section::::Background.
   Caesar said "Why shouldn't I remember, even if I was exhausted? Because I was unable to walk I couldn't go to the nearby spring, and I would have been willing to crawl there on hands and knees, if it were not for a good soldier, a brave industrious chap, hadn't brought me water in his helmet?" to which the man replied,
   The human body has two methods of thermogenesis, which produces heat to raise the core body temperature. The first is shivering, which occurs in an unclothed person when the ambient air temperature is under 25 °C (77 °F). It is limited by the amount of glycogen available in the body. The second is non-shivering, which occurs in brown adipose tissue.
   Excessive thermal insulation has been associated with an increased incidence of sudden infant death syndrome (SIDS). The primary causes are an excess of bedding or clothing, soft sleep surfaces, and stuffed animals. The odds ratio of SIDS associated with thermal insulation at least two togs above the lower critical value (after adjusting for season and confounding factors) was 1.35 in a New Zealand study, which also found that SIDS had some correlation with too little thermal insulation. A 1984 study of 34 infant cot deaths found that for 2/3 excessive clothing and over-wrapping was a contributing cause.
  