Neurobiology of sleep

Kuštek, Ivana (2010) Neurobiology of sleep. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Sleep is a reversible physiological process and it represents condition of reduced conscience when the body rests. It has two phases; NREM and REM phase. Sleep cycle lasts for about 90 minutes and it is repeated three to six times during the night. NREM is consisted of four phases and sleep gets deeper as the phases progress. About 20 – 25% of total night sleep is REM phase and most dreams happen in this phase. Its characteristics are muscle atonia, lack of thermoregulation and rapid eye movement. Hypothalamus and brain stem are control centers of sleep cycle. The most important nucleus of hypothalamus is suprachiasmatic nucleus (SCN). SCN controls sleep cycle with the signals from ventrolateral preoptic area, tuberomammilary nucleus and pineal gland. Noradrenaline and serotonin neurons are situated in brain stem and they are most active during wakefulness. Lack of sleep can have physiological and psychological consequences. Only in rare cases it can cause hallucinations and psychoses. Insomnia, hypersomnia and parasomnias are the most common sleep disorders. The cause of these disorders can be medical or psychological.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Hranilović, Dubravka
Date: 2010
Number of Pages: 15
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 02 Dec 2014 13:11
Last Modified: 02 Dec 2014 13:11
URI: http://digre.pmf.unizg.hr/id/eprint/3419

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