睡眠为题英语作文
Sleep
It'sclearthateveryoneneedstosleep.Mostpeoplerarelythinkabouthowandwhytheysleep,however.Weknowthatifwesleepwell,wefeelrested.Ifwedon'tsleepenough,weoftenfeeltiredandirritable.
Itseemstherearetwopurposesofsleep:physicalrestandemotionalandpsychologicalrest.Weneedtorestourbodiesandminds.Bothareimportantinorderforustobehealthy.Eachnightwealternatebetweentwokindsofsleep:activesleepandpassivesleep.Thepassivesleepgivesourbodytherestthat'sneededandpreparesusforactivesleep,inwhichdreamingoccurs.
Throughoutthenight,peoplealternatebetweenpassiveandactivesleep.Thebrainrests,thenitbecomesactive,thendreamingoccurs.Thecycleisrepeated:thebrainrests,thenitbecomesactive,thendreamingoccurs.Thiscycleisrepeatedseveraltimesthroughoutthenight.Duringeighthoursofsleep,peopledreamforatotalofoneandhalfhoursontheaverage.
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