3aref leh enta betnam? momken tefakar ennak ta3ban. aw momken 7ad allek en elnom kowayes leek. bas mahadesh 3aref bezabt leh wala ezay elnas betnam.

Le7ad awayel el1950s, mo3zam el3olama2 kano faker en elgesm wel mo5 beyerta7o wakt elnom. ba3d keda fe 3alem kan beyrakeb elnas wehoma naymin. la7az eno 5elal fatrat men 5 le 30 daka2ek, 3enen elnas elly nayma beteta7arak besora3a, ka2enohom beyetfarago 3ala 7aga. samma el fatrat di REM sleep, ya3ni 7arakat el3en elsari3a. wel fatrat elly el3enen feha makanetch betet7arak sammaha non-REM sleep.

Kol ma el3alem kan bey sa7y 7ad 5elal REM sleep, kano beyekono bey7lamo a7lam wade7a. el keyasat bayenet en nabdat elnas elly nayma betzed besora3a 5elal REM sleep. tanafoshom, darbat albohom, wel dam elly rayeh lel mo5 kaman beyezed. badal ma yekon wakt ra7a, REM sleep da wakt elgesm beyekon beyeshta8al gamed. el3olama2 lesa mesh 3arfin elsabab. ba3dohom beyefakar en REM sleep beyesa3ed fel ta3allom. elatfal beyekodo wakt ketir fel REM sleep. 3ashan keda, ba3d el3olama2 beyefakaro en REM sleep beyesa3ed elmo5 yekbar. we ba3dohom beyefakar en REM sleep da wakt elmo5 beyefady feeh zobalat elyom.

7aga wa7da kol el3olama2 motafkeen 3aleha en elnom darory. men 8er nom kafi, elnas bete3mel a5ta2. mo3zam 7awades el3arabeyat elkebeera bete7sal fel soba7 elbokkir, lama elnas beyekono 3andhom a3la e7sas belno3as.
5elal REM sleep, tanafos wel daraban beta3 el2alb beta3 elsha5s ___.
beyewakaf beyezed beyekal beyefadal zay ma howa