It can cause you to have fatigue during your waking hours. I’m just not sure how me laying down and falling asleep would lead one to that conclusion.
Any fatigue I have is easily explained, I work hard all day, then the “second job” of transporting my daughter to auditions, rehearsals, performances, etc., then I come home and do laundry until 12-1 AM, and I’m up at 6:15 to do it all again. I don’t get adequate sleep.
I would add, I can sit up all night without falling asleep, but when I get comfortable and lay down, out go the lights.