A businessman worked woo much .He found that he couldn't sleep at night.but often fell asleep d__

A businessman had worked too much ． He found that he couldn’t sleep at night,but often fell asleep in the day ． He became very worried,so he went to see his doctor ．
“Can you help me,doctor?” he asked ． I slept so well,but now I slept less than two hours at night ． ”
The doctor looked him over carefully,gave him some tests,asked him to work less hard,and told him to take some medicine to help him ． He said he was sure that he was not seriously ill,and that he would soon be better ．
But the businessman grew worse instead of better ． He slept even less than before at night and was still falling asleep in his office ． He visited the doctor again and again and it took the doctor a long time to find out the reason:the businessman’s wife was giving him the sleeping medicine in the morning and the ones to keep him awake at night.