Dreams Dreams

Dreams

Dreams

DreamCycle

Dreamcyclerefersto thepatternin which dreamsoccur,especiallyduring theREM sleep.Itisestimatedthatanormalpersondreamsfora totalof abouttwo orthree hourseachnight(Nordqvist, 2014). Everynight,anormalpersonbeginswith thenon-REM sleep,which has three stages,before gettingto thefourth (deepsleep)stagewheredreamingstarts.Thefirststageischaracterizedby non-rapid movementof theeyes,the secondstageby a dropin temperature,andthethirdone by a deepersleepandlowmetabolic rate(Robinson, 2014). Thelast(dreamingstage)ischaracterizedby backandforthmovementof theeyes.Thiscycleof sleeppatterncan be repeatedseveraltimesduringthenight,butthelengthof thenon-REM stagesreduceswith time,whilethelengthof thedreaming stageincreasesup to approximately2 hours.Itisestimatedthatanormalpersonexperiencesbetween 3 and4 REM sleepstageseverynight(Nordqvist, 2014). Thismeansthatthedreamcyclecan becomprisedof 3-4 REM stagesin a singlenight.

REMsleep

REMsleepcan be defined as the laststageofthesleepcycle,which is characterizedby rapideyemovement(REM). During thisstage,theeyesmoveerraticallyas iftheyare lookingat something from beneath theeyelid (Nordqvist, 2014). Inspiteoftheeyemovement,REM is knownto be thedeepsleepstage,andin which dreamsoccur.Thisstageconsumesabout 20-25 % of thetimespendin sleepby an adultandmorethan 50 % by an infant(Nordqvist, 2014). Somepeopleexperienceparalysisduring thisstageandendupdreamingsilently.However,musclesmay continuemovingin a fewcasesandthisculminatesin dramaticorviolentdreams.

Sleepdeprivation

Sleepdeprivationrefersto a conditionthatoccurswhenone failsto getsufficientsleep.Thelossof sleepcan becausedby manyfactors,includingcertainmedicalconditions(suchas diabetes), alcoholism,consumptionof certainpharmaceutical products(suchas steroids), pain,andbeingoverworked (Gutstein, 2014).Sleepdeprivationcan resultin fatigue,clumsiness,andclinical depression.Persistentcasesof sleepdeprivationcan resultinheartdisease,diabetes, hypertension, orobesity (Gutstein, 2014). Therefore,sleepdeprivationis detrimentalto humanhealth.

References

Gutstein,S. (2014). Surprising sleep wrecks. WebMD.Retrieved March 6, 2014, fromhttp://www.webmd.com/sleep-disorders/features/6-surprising-sleep-wreckers?page=3

Nordqvist,J. (2014, September 26). What is rapid eye movement sleep? What isREM? MNT.Retrieved March 6, 2015, fromhttp://www.medicalnewstoday.com/articles/247927.php

Robinson,J. (2014). Sleep disorders health center. WebMD.Retrieved March 6, 2015, fromhttp://www.webmd.com/sleep-disorders/guide/sleep-101