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A painting shows two children sleeping.
Sleep, which we all experience, is a quiet and mysterious pause in our daily lives. Two sleeping children are depicted in this 1895 oil painting titled Zwei schlafende Mädchen auf der Ofenbank , which translates as “two sleeping girls on the stove,” by Swiss painter Albert Anker.

This chapter will discuss states of consciousness with a particular emphasis on sleep. The different stages of sleep will be identified, and sleep disorders will be described. The chapter will close with discussions of altered states of consciousness produced by psychoactive drugs, hypnosis, and meditation.

References

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Alhola, P.&Polo-Kantola, P. (2007). Sleep Deprivation: Impact on cognitive performance. Neuropsychiatric Disease and Treatment, 3 , 553–557.

Alladin, A. (2012). Cognitive hypnotherapy for major depressive disorder. The American Journal of Clinical Hypnosis, 54 , 275–293.

American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). Arlington, VA: Author.

Aquina, C. T., Marques-Baptista, A., Bridgeman, P.,&Merlin, M. A. (2009). Oxycontin abuse and overdose. Postgraduate Medicine, 121 , 163–167.

Arnulf, I. (2012). REM sleep behavior disorder: Motor manifestations and pathophysiology. Movement Disorders, 27 , 677–689.

Augustinova, M.,&Ferrand, L. (2012). Suggestion does not de-automatize word reading: Evidence from the semantically based Stroop task. Psychonomic Bulletin&Review, 19 , 521–527.

Banks, S.,&Dinges, D. F. (2007). Behavioral and physiological consequences of sleep restriction. Journal of Clinical Sleep Medicine, 3 , 519–528.

Bartke, A., Sun, L. Y.,&Longo, V. (2013). Somatotropic signaling: Trade-offs between growth, reproductive development, and longevity. Physiological Reviews, 93 , 571–598.

Berkowitz, C. D. (2012). Sudden infant death syndrome, sudden unexpected infant death, and apparent life-threatening events. Advances in Pediatrics, 59 , 183–208.

Berry, R. B., Kryger, M. H.,&Massie, C. A. (2011). A novel nasal excitatory positive airway pressure (EPAP) device for the treatment of obstructive sleep apnea: A randomized controlled trial. Sleep, 34 , 479–485.

Bixler, E. O., Kales, A., Soldatos, C. R., Kales, J. D.,&Healey, S. (1979). Prevalence of sleep disorders in the Los Angeles metropolitan area. American Journal of Psychiatry, 136 , 1257–1262.

Bostwick, J. M. (2012). Blurred boundaries: The therapeutics and politics of medical marijuana. Mayo Clinic Proceedings, 87 , 172–186.

Brook, R. D., Appel, L. J., Rubenfire, M., Ogedegbe, G., Bisognano, J. D., Elliott, W. K., . . . Rajagopalan, S. (2013). Beyond medications and diet: Alternative approaches to lowering blood pressure: A scientific statement from the American Heart Association. Hypertension, 61 , 1360–1383.

Broughton, R., Billings, R., Cartwright, R., Doucette, D., Edmeads, J., Edwardh, M., . . . Turrell, G. (1994). Homicidal somnambulism: A case report. Sleep, 17 , 253–264.

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Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
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In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
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At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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While the American heart association suggests that meditation might be used in conjunction with more traditional treatments as a way to manage hypertension
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Source:  OpenStax, Chapter 6: states of consciousness sw. OpenStax CNX. Jun 08, 2015 Download for free at https://legacy.cnx.org/content/col11818/1.1
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