Just recently, I read a medical article from a sleep expert who says there isn't a major organ within the body or a process within the brain that isn't detrimentally impaired when we don't get enough sleep.
There is another article that I've also read recently: You can fool the conscious mind by masking noise, but you cannot fool the unconscious mind. It is the one that is affecting all our organs and body.
From my point of view, last night was the only night I got a good night's sleep in the last three nights, because the wind has been blowing from the northwest and our runway is being used frequently throughout the day. Two nights ago, there were more than 30 planes that went over. I couldn't get any sleep. The night before last, it was the same thing. The bags under my eyes are really not a reflection of my age. That is just sleep deprivation.