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Topic: Sleep cycle

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	Polyphasic sleep - Wikipedia, the free encyclopedia
		According to Stampi, the improvement is due to an extraordinary evolutionary predisposition to adopt such a sleep schedule; he hypothesizes this is possibly because polyphasic sleep was the preferred schedule of ancestors of the human race for thousands of years prior to the adoption of the monophasic schedule.
		Advocates of polyphasic sleep often claim that the procedure boosts their alertness, but skeptics question whether this alertness is related to the sleep pattern or whether increased adrenaline and cortisol is gained from eagerness to succeed in their polyphasic experiment and their other productive pursuits.
		Polyphasic sleep is also thought to increase REM sleep, but it may also be likely to upregulate slow-wave sleep, causing a polyphasic sleeper to gain less REM sleep in a given period of time than with standard sleep patterns.
	en.wikipedia.org /wiki/Polyphasic_sleep (2297 words)

	Sleep Stages - SleepChannel
		Although the signals for transition between the five (or six) stages of sleep are mysterious, it is important to remember that these stages are, in fact, discretely independent of one another, each marked by subtle changes in bodily function and each part of a predictable cycle whose intervals are observable.
		Sleep deprivation, frequently changing sleep schedule, stress, and environment all affect the progression of the sleep cycle.
		The percentage of REM sleep is highest during infancy and early childhood, drops off during adolescence and young adulthood, and decreases further in older age.
	www.sleepdisorderchannel.com /stages (999 words)

	Getting the Sleep You Need: Sleep Stages, Sleep Tips and Aids
		Sleep is a periodic state of rest during which consciousness of the world is interrupted.
		Sleep is crucial for teenagers because it is while they are sleeping that their bodies release a hormone that is essential during their growth spurt.
		Sleep, Sleep Disorders, and Biological Rhythms: Information About Sleep – A comprehensive teacher's guide that describes the biology of sleep, common sleep misconceptions, sleep requirements (for humans and different types of animals), and sleep disorders.
	www.helpguide.org /life/sleeping.htm (3933 words)

	Sleep—Information about Sleep
		Sleep disorders, including sleep apnea (that is, absence of breathing during sleep), insomnia, and narcolepsy, may require behavioral, pharmacological, or even surgical intervention to relieve the symptoms.
		While REM sleep is turned on and off by the pons (see section 3.3 Sleep and the brain), two areas in the cerebral hemispheres (areas far from the pons that control higher mental functions) regulate dreaming.
		REM sleep and dreaming can be dissociated from one another, as seen after the administration of certain drugs or in cases of brain damage either to the pons (loss of REM sleep but not of dreaming) or to the frontal areas (no dreaming but REM sleep cycle unaffected).
	science.education.nih.gov /supplements/nih3/sleep/guide/info-sleep.htm (8598 words)

	National Sleep Foundation
		Sleep is especially important for children as it directly impacts mental and physical development.
		During the deep states of NREM sleep, blood supply to the muscles is increased, energy is restored, tissue growth and repair occur, and important hormones are released for growth and development.
		For newborns, sleep during the early months occurs around the clock and the sleep-wake cycle interacts with the need to be fed, changed and nurtured.
	www.sleepfoundation.org /hottopics/index.php?secid=11&id=39 (1058 words)

	www.glenrhodes.com - The power of the Sleep Cycle (Site not responding. Last check: 2007-11-01)
		If we were to sleep completely naturally, with no alarm clocks or other sleep disturbances, we would wake up, on the average, after a multiple of 90 minutes--for example, after 4 1/2 hours, 6 hours, 7 1/2 hours, or 9 hours, but not after 7 or 8 hours, which are not multiples of 90 minutes.
		In the period between cycles we are not actually sleeping: it is a sort of twilight zone from which, if we are not disturbed (by light, cold, a full bladder, noise), we move into another 90-minute cycle.
		In addition, polyphasic behavior is the predominant mode of sleeping for human infants, and even in the later years, children have to slowly be weaned from the afternoon nap.
	glenrhodes.com /index.php?option=com_content&task=view&id=54&Itemid=9 (1288 words)

	MedlinePlus Medical Encyclopedia: Sleep walking
		Sleep walking in adults can be associated with mental disorders, reactions to drugs and alcohol, or medical conditions such as partial complex seizures.
		In the elderly, sleep walking may be a symptom of an organic brain syndrome or REM behavior disorders.
		It is not dangerous to awaken a sleep walker, although it is common for the person to be confused or disoriented for a short time on awakening.
	www.nlm.nih.gov /medlineplus/ency/article/000808.htm (713 words)

	Brain Basics: Understanding Sleep: National Institute of Neurological Disorders and Stroke (NINDS)
		Sleep deprivation is an effective therapy for people with certain types of depression, while it can actually cause depression in other people.
		Sleep apnea is a disorder of interrupted breathing during sleep.
		Mild sleep apnea frequently can be overcome through weight loss or by preventing the person from sleeping on his or her back.
	www.ninds.nih.gov /disorders/brain_basics/understanding_sleep.htm (4962 words)

	free-running sleep (Site not responding. Last check: 2007-11-01)
		'''Free-running sleep''' is sleep that is not artificially regulated.
		Only a small part of the population can sleep in a perfect 24 hour cycle and in synchrony with the schedules demanded by work and family.
		The most typical violation of free-running sleep is the use of an alarm clock.
	encyclopedia.mysleepcenter.com /free-running_sleep.htm (189 words)

	Sleep — Detailed explanations of both basic and medical information pertaining to this nightly activity on ...
		During sleep, we usually pass through five phases of sleep: stages 1, 2, 3, 4, and REM (rapid eye movement) sleep.
		Since sleep and wakefulness are influenced by different neurotransmitter signals in the brain, foods and medicines that change the balance of these signals affect whether we feel alert or drowsy and how well we sleep.
		If our REM sleep is disrupted one night, our bodies don't follow the normal sleep cycle progression the next time we doze off.
	www.medicinenet.com /sleep/article.htm (1021 words)

	☞ sleep - cycle rem sleep - cycle rem sleep online guide (Site not responding. Last check: 2007-11-01)
		Sleep cycle is the cycle in which non-REM and REM sleep alternate in 90- to 110- minute phases.
		Sleep consists of two distinct states that rotate in cycles and reflects differing levels of brain...
		The percentage of REM sleep is highest during infancy and early childhood...
	www.all-sleep.info /remsleep/cycle-rem-sleep.html (697 words)

	The Sleep Cycle
		Sleep is a most common phenomenon of life; and, though every human being goes through the experience from birth to death, few have any correct knowledge as to the cause of sleep, the nature and purpose of sleep, and how the consciousness functions during those hours of sleep.
		The alternation of day and night, waking and sleeping, activity and rest, is a common fact, and each human being has to make practical application of the great Law of Cycles or Periodicity in his daily life if he would live in harmony with Nature.
		Between waking and deep sleep is the borderland of swapna, which is to be crossed both ways, from waking to deep sleep and from deep sleep to waking; and the less one gets involved in that dream state the better for him.
	www.teosofia.com /Mumbai/7112cycle.html (1324 words)

	Sleep News Articles (Site not responding. Last check: 2007-11-01)
		The menstrual cycle, pregnancy and menopause all have an impact on sleep.
		In the monthly cycle, sleep tends to be worse during menstruation.
		Sleep apnea (when someone stops breathing during sleep), is usually more common in men than in women.
	www.sleepanddreams.ca /Sleep/Sleep_News/Sleep_News_Articles/sleep_news_articles_9.html (482 words)

	Common Sleep Problems
		The final stage of the sleep cycle is known as REM sleep because of the rapid eye movements that occur during this stage.
		One common cause of obstructive sleep apnea is enlarged tonsils or adenoids (tissues located in the passage that connects the nose and throat).
		So even if the person doesn't notice the feelings of heartburn because he or she is sleeping, the discomfort it causes can still interfere with the sleep cycle.
	kidshealth.org /teen/your_body/take_care/sleep.html (1560 words)

	Practicing good sleep hygiene
		Sleep hygiene involves engaging in a number of practices and behaviors that improve sleep.
		An example of poor sleep hygiene habits includes such things as varying the time that one goes to bed and awakens in the morning, taking naps during the day, engaging in stressful activities such as paying bills while laying in bed, staying in bed most of the day, among other things.
		One of the most common disrupted sleep-wake patterns for the chronic back pain sufferer is to “get sleep when I can.” Therefore, if the individual happens to not fall sleep until 2:00 a.m., he or she might compensate by “sleeping in” until noon.
	www.spine-health.com /topics/conserv/insomnia/insomnia3.html (1161 words)

	Sleep, sleep cycle, sleep stages
		Sleepers alternate between REM and NREM sleep four to six times a night, with each cycle lasting an average of 90 minutes, with an average range of 70 to 110 minutes.
		Although deep sleep dominates the first two sleep cycles, it occurs less frequently as the night wears on.
		Sleeping pills and other medications suppress both deep sleep and the REM phase of sleep.
	www.holistic-online.com /Remedies/Sleep/sleep_stages-sleep-cycle.htm (266 words)

	The Normal Sleep Cycle
		Normal sleepers have a relatively predictable "sleep architecture" â” the term used to describe an alternating pattern of REM (rapid eye movement) and non-REM sleep, or active sleep and quiet sleep.
		The normal sleep cycle lasts about 90 minutes, and is repeated four to six times per night.
		If you sleep too much or too little, have unrestful sleep, or are experiencing symptoms that may be sleep-related, ask your physician for a prescription to visit the Center for Sleep Disorders.
	www.centrastate.com /body.cfm?id=993 (404 words)

	Documentation on sleep
		Sleep, natural state of rest characterized by reduced body movement and decreased awareness of surroundings.
		Sleep is distinguished from other sleeplike states, for instance, hibernation or coma, because it is easily interrupted by external stimulation, such as a loud noise....
		In his sleep laboratory at the University of Chicago, Rechtschaffen places each rat on an enclosed turntable contraption that begins spinning whenever the rodent's brain waves suggest it is beginning to nod o...
	sommeil.univ-lyon1.fr /articles/listes/en/1.html (731 words)

	Dream Moods: Dream Research: The Sleep Cycle (Site not responding. Last check: 2007-11-01)
		Dreams can occur in any of the four stages of sleep but the most vivid and memorable dreams occur in the last stage of sleep (also commonly referred to as REM sleep).
		The sleep cycle repeats itself about an average of four to five times per night, but may repeat as many as seven times.
		The stages in the sleep cycle are organized by the changes in specific brain activity.
	www.dreammoods.com /dreaminformation/dreamresearch.htm (553 words)

	Sleep cycle
		However if you sleep eight hours a night or more and still awake less than refreshed, chances are you're getting too much sleep.
		The deeper stages of sleep (stages 3 and 4) are the most restorative.
		The rest of the night is spent in REM (dreaming) sleep and the lighter stages.
	www.healthmyself.com /wellness/05011574.htm (585 words)

	Amazon.com: Sleep Cycle: Music: Brannan Lane & Nature (Site not responding. Last check: 2007-11-01)
		A very low and slow frequency is sent from the front portion of the brain when you are in your deepest sleep or rest.
		During this cycle of rest, powers of the body are restored.
		Lane bills this CD as music to sleep to, and I suspect it would be good for that, provided you like to nod off with dark, pensive thoughts in your head.
	www.amazon.com /exec/obidos/tg/detail/-/B00005LM09?v=glance (577 words)

	MySleepCenter: Sleep Robbers (Site not responding. Last check: 2007-11-01)
		Cure their sleep apnea with the help of a doctor, and the sleep of two people is improved!
		Try to time the nap to be no later than the middle of the previous nights sleeping time, and try to make due with a nap of 15 minutes.
		If neccessary sleep up to one and a half hours to get a complete sleep cycle, but no longer.
	www.mysleepcenter.com /SleepRobbers.html (249 words)

	Sleep Education.com
		Please help me figure out what to do about sleep problem
		Appetite and Metabolism May be Linked to the Sleep-Wake Cycle
		Brain Wave Changes in Sleep Begin Ealier in Girls than Boys
	www.sleepeducation.com /Topic.aspx?id=6 (945 words)

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