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Non-rapid eye movement sleep

non rapid eye movement sleep, non rapid eye movement sleep disorder
Non-rapid eye movement sleep, or NREM, is, collectively, sleep stages 1–3, previously known as stages 1–4 Rapid eye movement sleep REM is not included There are distinct electroencephalographic and other characteristics seen in each stage Unlike REM sleep, there is usually little or no eye movement during these stages Dreaming is rare during NREM sleep, and muscles are not paralyzed as in REM sleep People who do not go through the sleeping stages properly get stuck in NREM sleep, and because muscles are not paralyzed a person may be able to sleepwalk1 According to studies, the mental activity that takes place during NREM sleep is believed to be thought-like, whereas REM sleep includes hallucinatory and bizarre content2 The mental activity that occurs in NREM and REM sleep is a result of two different generators, which also explains the difference in mental activity2 In addition, there is a parasympathetic dominance during NREM3 During the period of Non-REM sleep, the mindset of a person is more organized4 The differences in the REM and NREM activity reported is believed to arise from differences in the memory stages that happen during the two methods of sleep2 It has been found through several experiments that low levels of stage 3 sleep are found in about 40-50% of people with acute and chronic schizophrenia who typically portray abnormal non-rapid eye movement sleep5

Contents

  • 1 Stages of NREM sleep
  • 2 Sleep spindles and K-complexes
  • 3 Dreaming during NREM
  • 4 Muscle movements during non-REM
  • 5 Parasomnias
  • 6 Polysomnography
  • 7 Slow-wave sleep
  • 8 References
  • 9 Further reading

Stages of NREM sleepedit

NREM sleep was divided into four stages in the Rechtschaffen and Kales R&K standardization of 1968 That has been reduced to three in the 2007 update by The American Academy of Sleep Medicine AASM6

  • Stage 1 – occurs mostly in the beginning of sleep, with slow eye movement This state is sometimes referred to as relaxed wakefulness7 Alpha waves disappear and the theta wave appears People aroused from this stage often believe that they have been fully awake During the transition into stage-1 sleep, it is common to experience hypnic jerks8
  • Stage 2 – no eye movement occurs, and dreaming is very rare The sleeper is quite easily awakened EEG recordings tend to show characteristic "sleep spindles", which are short bursts of high frequency brain activity,9 and "K-complexes" during this stage
  • Stage 3 – previously divided into stages 3 and 4, is deep sleep, slow-wave sleep SWS Stage 3 was formerly the transition between stage 2 and stage 4 where delta waves, associated with "deep" sleep, began to occur, while delta waves dominated in stage 4 In 2007, these were combined into just stage 3 for all of deep sleep10 Dreaming is more common in this stage than in other stages of NREM sleep though not as common as in REM sleep The content of SWS dreams tends to be disconnected, less vivid, and less memorable than those that occur during REM sleep11 This is also the stage during which parasomnias most commonly occur Various education systems eg the VCAA of Australian Victorian education practice still practice the stages 3 & 4 separation

Sleep spindles and K-complexesedit

Sleep spindles are unique to NREM sleep The most spindle activity occurs at the beginning and the end of NREM Sleep spindles involve activation in the brain in the areas of the thalamus, anterior cingulate and insular cortices, and the superior temporal gyri They have different lengths There are slow spindles in the range of 11 – 13 Hz that are associated with increased activity in the superior frontal gyrus, and fast spindles in the range of 13 – 15 Hz that are associated with recruitment of sensorimotor processing cortical regions, as well as recruitment of the mesial frontal cortex and hippocampus There is no clear answer as to what these sleep spindles mean, but ongoing research hopes to illuminate their function12

K-complexes are single long delta waves that last for only a second13 They are also unique to NREM sleep They appear spontaneously across the early stages, usually in the second stage, much like the sleep spindles However, unlike sleep spindles, they can be voluntarily induced by transient noises such as a knock at the door The function of these K-complexes is unknown and further research needs to be conducted14

Dreaming during NREMedit

Although study participants' reports of intense dream vividness during REM sleep and increased recollection of dreams occurring during that phaseclarification needed suggest that dreaming most commonly occurs during that stageclarification needed, dreaming can also occur during NREM sleep, in which dreams tend to be more mundane in comparison15

Research has also shown that dreams during the NREM stage most commonly occur during the morning hours which is also the time period with the highest occurrence of REM sleep This was found through a study involving subjects taking naps over specific intervals of time and being forcefully awakened, their sleep was separated into naps including only REM sleep and only NREM sleep using polysomnography This implies that the polysomnographic occurrence of REM sleep is not required for dreaming Rather, the actual mechanisms that create REM sleep cause changes to one's sleep experience Through these changes, by morning, a sub-cortical activation occurs during NREM that is comparable to the type that occurs during REM It is this sub-cortical activation that results in dreaming during the NREM stage during the morning hours16

Muscle movements during non-REMedit

During non-REM sleep, the tonic drive to most respiratory muscles of the upper airway is inhibited This has two consequences:

  1. The upper airway becomes more floppy
  2. The rhythmic innervation results in weaker muscle contractions because the intracellular calcium levels are lowered, as the removal of tonic innervation hyperpolarizes motoneurons, and consequently, muscle cells

However, because the diaphragm is largely driven by the autonomous system, it is relatively spared of non-REM inhibition As such, the suction pressures it generates stay the same This narrows the upper airway during sleep, increasing resistance and making airflow through the upper airway turbulent and noisy For example, one way to determine whether a person is sleeping is to listen to their breathing - once the person falls asleep, their breathing becomes noticeably louder Not surprisingly, the increased tendency of the upper airway to collapse during breathing in sleep can lead to snoring, a vibration of the tissues in the upper airway This problem is exacerbated in overweight people when sleeping on the back, as extra fat tissue may weigh down on the airway, closing it This can lead to sleep apneacitation needed

Parasomniasedit

The occurrence of parasomnias is very common in the last stage of NREM sleep A parasomnia is a sleep behavior that affects the function, quality, or timing of sleep It is caused by a physiological activation in which the person's brain is caught between the stages of falling asleep and waking from sleep The autonomous nervous system, cognitive process, and motor system are activated during sleep or while the person wakes up from sleep

Some examples of parasomnias are somnambulism sleep walking, somniloquy sleep talking, sleep eating, nightmares or night terrors, sleep paralysis, and sexsomnia or "sleep sex" Many of these have a genetic component, and can be quite damaging to the person with the behavior or their bed partner Parasomnias are most common in children, but most children have been found to outgrow them with age However, if not outgrown, they can cause other serious problems with everyday life17

Polysomnographyedit

Polysomnography PSG is a test used in the study of sleep; the test result is called a polysomnogram Below are images of the NREM stages 1, 2 and 3

The figures represent 30-second epochs 30 seconds of data They represent data from both eyes, EEG, chin, microphone, EKG, legs, nasal/oral air flow, thermistor, thoracic effort, abdominal effort, oximetry, and body position, in that order EEG is highlighted by the red box Sleep spindles in the stage 2 figure are underlined in red

Stage N1:

Stage N2:

Stage N3:

Slow-wave sleepedit

Slow-wave sleep SWS is made up of the deepest stage of NREM, and is often referred to as deep sleep

The highest arousal thresholds eg difficulty of awakening, such as by a sound of a particular volume are observed in stage 3 A person will typically feel groggy when awoken from this stage, and indeed, cognitive tests administered after awakening from stage 3 indicate that mental performance is somewhat impaired for periods up to 30 minutes or so, relative to awakenings from other stages This phenomenon has been called "sleep inertia"

After sleep deprivation there is usually a sharp rebound of SWS, suggesting there is a "need" for this stage18

Slow Wave Sleep SWS is a highly active state unlike a state of brain quiescence as previously thought Brain imaging data has shown that during nonREM sleep the regional brain activity is influenced by the waking experience just passed

A study was done involving an experimental and a control group to have them learn to navigate a 3D maze The blood flow in the parahippocampal gyrus increased in conjunction with the individual's performance through the 3D maze Participants were then trained in the maze for 4 hours and later, during the various sleep cycles of nonREM sleep, REM sleep and wakefulness, they were scanned twelve times using a PET scan during the night The PET scan demonstrated a higher blood flow in the hippocampus during SWS/non-REM sleep due to the training from the previous day while the control group exhibited no increased blood flow and they had not received the training the prior day The brain activity during sleep, according to this study, would show the events of the previous day do make a difference One theory suggests a model of Hippocampal-neocortical dialogue "Two stages of hippocampal activity have been proposed, the first being the recording of the memory during waking and the second involving the playback of the memory during nonREM sleep This process of reactivation of memory firing sequences is believed to gradually reinforce initially weak connections between neocortical sites allowing the original information to be activated in the cortex independently of the hippocampus, and thus ensuring refreshed encoding capacity of the hippocampus" Maquet concluded that the areas of the brain involved with information processing and memory have increased brain activity during the slow wave sleep period Events experienced in the previous day have more efficient and clearer memory recall the next day thus indicating that the memory regions of the brain are activated during SWS/non-REM sleep instead of being dormant as previously thought19

Referencesedit

  1. ^ OConnell, C 2010, Mar 09 Why do some people sleepwalk Irish Times, pp 7 Retrieved from http://searchproquestcom/docview/309237844
  2. ^ a b c Manni,Raffaele "Rapid Eye Movement Sleep, Non-rapid Eye Movement Sleep, Dreams, and Hallucinations" 2005;7:196-197
  3. ^ Andreasen, Nancy C; Black, Donald W 2006 Introductory Textbook of Psychiatry American Psychiatric ISBN 1-58562-272-9 
  4. ^ McNamara, Patrick; Johnson, Patricia; McLaren, Deirdre; Harris, Erica; Beauharnais, Catherine 2010 "Rem And Nrem Sleep Mentation" International Review of Neurobiology Elsevier Inc 92: 69–86 doi:101016/s0074-77421092004-7 
  5. ^ Hiatt John F, Floyd Thomas C, Katz Paul H, Feinberg Irwin "Further Evidence of Abnormal Non-Rapid-Eye-Movement Sleep in Schizophrenia" 1985 Volume 42 New York: Northport
  6. ^ Schulz, Hartmut 2008 "Rethinking sleep analysis Comment on the AASM Manual for the Scoring of Sleep and Associated Events" J Clin Sleep Med American Academy of Sleep Medicine 4 2: 99–103 PMC 2335403 PMID 18468306 
  7. ^ Green, Simon 2011 Biological Rhythms, Sleep and Hypnosis New York: Palgrave MacMillan ISBN 978-0-230-25265-3 
  8. ^ National Institute of Neurological Disorders and Stroke, Understanding sleep
  9. ^ Green, Simon 2011 Biological Rhythms, Sleep and Hypnosis New York: Palgrave Macmillan ISBN 978-0-230-25265-3 
  10. ^ "Glossary A resource from the Division of Sleep Medicine at Harvard Medical School, Produced in partnership with WGBH Educational Foundation" Harvard University 2008 Retrieved 2009-03-11 The 1968 categorization of the combined Sleep Stages 3–4 was reclassified in 2007 as Stage N3 
  11. ^ McNamara, P; McLaren, D; Durso, K June 2007 "Representation of the Self in REM and NREM Dreams" Dreaming 17 2: 113–126 doi:101037/1053-0797172113 PMC 2629609 PMID 19169371 
  12. ^ Cline, John "Sleep Spindles" Psychology Today 
  13. ^ Jordan, Paul "NREM Sleep: Stages 1, 2, and 3" 
  14. ^ "Revisiting the K-Complex and Appraisal to Scientific Debate" Dormigivilia 
  15. ^ Dement W, Kleitman N The relation of eye movements during sleep to dream activity: an objective method for the study of dream J Exp Psychol 1957; 53: 339–346
  16. ^ Suzuki H; Uchiyama M; Tagaya H et al Dreaming during nonrapid eye movement sleep in the absence of prior rapid eye movement sleep SLEEP 2004;278:1486-90
  17. ^ Schenck, Carlos "Sleep and Parasomnias" National Sleep Foundation 
  18. ^ "Selective slow-wave sleep SWS deprivation and SWS rebound: do we need a fixed SWS amount per night" 1999 PMID 11382878 Visually scored delta activity stages 3 and 4, SWS as well as computerized delta activity measures increase after total and selective sleep deprivation It is, however, still controversial if SWS amount is only a function of prior waking duration, or if it is related to the structure of the previous sleep period  Missing or empty |url= help; |access-date= requires |url= help
  19. ^ Maquet, Pierre, "Understanding non rapid eye movement sleep through neuroimaging" World Journal of Biological Psychiatry: June 2010, 11 S1, p 9-15, http://informahealthcarecom/doi/abs/103109/15622971003637736

"sleep" Encyclopædia Britannica Encyclopædia Britannica Online Encyclopædia Britannica Inc, 2011 Web 05 Dec 2011<http://wwwbritannicacom/EBchecked/topic/548545/sleep>

Further readingedit

  • Rechtschaffen, A; Kales, A 1968 A Manual of Standardized Terminology, Techniques and Scoring System For Sleep Stages of Human Subjects US Dept of Health, Education, and Welfare; National Institutes of Health 
  • M Massimini, G Tononi, et al, "Breakdown of Cortical Effective Connectivity During Sleep," Science, vol 309, 2005, pp 2228–32
  • P Cicogna, V Natale, M Occhionero, and M Bosinelli, "Slow Wave and REM Sleep Mentation," Sleep Research Online, vol 3, no 2, 2000, pp 67–72
  • D Foulkes et al, "Ego Functions and Dreaming During Sleep Onset," in Charles Tart, ed, Altered States of Consciousness, p 75
  • Rock, Andrea 2004 The Mind at Night ISBN 0-7382-0755-1 
  • Warren, Jeff 2007 "The Slow Wave" The Head Trip: Adventures on the Wheel of Consciousness ISBN 978-0-679-31408-0 
  • Iber, C; Ancoli-Israel, S; Chesson, A; Quan, SF for the American Academy of Sleep Medicine The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications Westchester: American Academy of Sleep Medicine; 2007
  • Manni, Raffaele "Rapid Eye Movement Sleep, Non-rapid Eye Movement Sleep, Dreams, and Hallucinations" 2005;7:196-197

non rapid eye movement sleep, non rapid eye movement sleep disorder, non-rapid eye movement sleep disorders


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