一段英文翻译…译成中文tired,but can't sleepwhy is it so difficult to fa

一段英文翻译…译成中文
tired,but can't sleep
why is it so difficult to fall asleep when you are overtired?There is no one answer that applies to every individual.But many people fail to note the distinction between fatigue-physical tiredness-and sleepiness,the inability to stay awake.
It's possible to feel "tierd" physically and still be unable to fall asleep.To fall asleep,youneed adequate time to relax,even if you gwwl fatigued.It's not so easy to simply "ture off."
Lack of sleep complicates matters further.Experts say adults need at least 7 to 8 hours of sleep a night to function properly.When you get less sleep than that on consecutive nights,you begin to produce "sleep debt."As the sleep debt increases(and functiionality decreases),your body expriences a stress response ang begins to release adrenaline.Now a vicious circle has been created:You experience the feeling of being more and more tired,but your body is increasingly stimulated,so it is hart to get sleepy.
"Power sleeping" for more hours on weekends is only a temporary solution.There is no substitute for getting a good night's sleep on a regular basis.
改正：
第二段，youneed改为you need
gwwl改为feel
第三段，functiionality改为functionality
ang改为and