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Why Bipolar Kids Can’t Get Up and Get Going

Thermoregulatory Disturbances

Children with bipolar disorder often have irregularities in their thermoregulatory systems. They are hot all the time—even when the ambient temperature feels cold (often very cold) to everyone else. Parents struggle constantly to get them to wear jackets in winter. In addition, it is not uncommon to see their ears turn beet red.

Scientists have found that the rapid onset of sleep occurs when the blood vessels in the skin of the hands and feet dilate and cause heat loss at the extremities. This causes the core body temperature to lower. A group of researchers, Drs. Kurt Krauchi, Christian Cajochen, and Anna Wirz-Justice, noted this functional relationship between core body temperature and sleepiness, and hypothesized that the opposite would also be true: the constriction of blood vessels would raise the core body temperature and the human being would come to a state of wakefulness. (Think colder at night and the onset of sleepiness; and warmer in the morning and the onset of wakefulness.)

The authors write:

The circadian clock prepares the thermoregulatory system for vasodilation to begin in the early evening as sleepiness increases, followed by a drop in core body temperature. Even lying down increases sleepiness by redistributing heat in the body from the core to the periphery. Turning out the light is a complex cognitive and physiological signal that also leads to vasodilation. There is a tight correlation between the timing of the endogenous increase in melatonin in the evening and vasodilation, an effect that is mimicked by pharmacological doses of melatonin. Before bedtime, then, many overlapping events orchestrate the thermoregulatory overture.

Could irregularities in the timing of melatonin release—a peptide known to reduce core body temperature and induce sleep—be a factor in the increased activity level seen at night and the marked sleep inertia seen in the morning? Melatonin, produced in the pineal gland, is secreted into the cerebral spinal fluid at dusk and diminishes its effect at dawn.

The pineal gland is a small reddish-gray structure that sits near the center of the brain. Its name is derived from the Latin word for “pine cone” because early viewers glimpsed a resemblance. The pineal gland has a story of its own.

The Pineal Gland

All vertebrates possess a pineal gland, and in certain reptiles and birds the gland is situated close enough to the top of the skull to monitor the intensity of sunlight. This “third eye” appears to help animals adjust to changes in the day-light cycles of the yearly seasons. Seventeenth-century philosopher Rene Descartes, thought the human pineal to be the seat of the rational soul; early 20th-century scientists felt that the buried-down-under human pineal had been abandoned by the roadside of human evolution.

Not so. In the mid-sixties, researchers discovered that the pineal gland secretes an important hormone called melatonin. As we mentioned above, it is a sleep-inducing hormone thought to have a part in the synchronization of circadian (daily) rhythms. In animals, melatonin influences seasonal breeding patterns. Its secretion is at the highest levels in winter.

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Today scientists accept that a kind of biological clock in the human organism establishes a fundamental daily rhythm for bodily functions such as temperature, the release of cortisol, rest/activity cycles, and the secretion of melatonin. But nature has built some flexibility into a human being so that the body can adjust to the ever-changing environmental rhythms-such as longer and shorter days in the summer and winter.

Apparently some people do not adjust so easily. Dr. Alfred Lewy, director of the Sleep and Mood Disorders Laboratory at Oregon Health and Science University, hypothesized that certain depressed people have a desynchronization in their 24-hour internal clock rhythms. For instance, their sleep, temperature, and cortisol cycles may be in synchrony with each other, but be out of step with other 24-hour rhythms, thus causing their internal rhythms to run a few hours behind or ahead of schedule. They either start and stop releasing melatonin earlier than usual (leading to evening sleepiness and early-morning awakening), or start and stop releasing melatonin later than usual (leading to difficulty sleeping at night as well as difficulty getting up in the morning). Exactly what is seen so often in children with bipolar disorder.

Why Bipolar Kids Can’t Get Up and Get Going


Demitri Papolos

APA Reference
Papolos, D. (2020). Why Bipolar Kids Can’t Get Up and Get Going. Psych Central. Retrieved on October 22, 2020, from https://psychcentral.com/lib/why-bipolar-kids-cant-get-up-and-get-going/
Scientifically Reviewed
Last updated: 17 Jan 2020 (Originally: 17 May 2016)
Last reviewed: By a member of our scientific advisory board on 17 Jan 2020
Published on Psych Central.com. All rights reserved.