Do you find getting up in the morning so difficult that it’s painful ? This might be called laziness , but Dr. Kleitman has a new explanation . He has proved that everyone has a daily energy cycle .

During the hours when you labour through your work , you may say that you’re “hot”. That’s true . The time of day when you feel most energetic is when your cycle of body temperature is at its peak . For some people that peak comes during the forenoon . For others it comes in the afternoon or evening . No one has discovered why this is so , but it leads to such familiar monologues （自言自语）as “Get up , John ! You’ll be late for work again !” The possible explanation to the trouble is that John is at his temperature—and —energy peak in the evening . Much family quarrelling ends when husbands and wives realize what these energy cycles mean , and which cycle each member of the family has .

You can’t change your energy cycle , but you can make your life fit it better . Habit can help . Dr . Kleitman believes . Maybe you’re sleepy in the evening but feel you must stay up late anyway . Counteract （打乱）your cycle to some extent by habitually staying up later than you want to . If your energy is low in the morning but you have an important job to do early in the day , rise before your usual hour . This won’t change your cycle , but you’ll get up steam and work better at your low point .

Get off to a slow start which saves your energy . Get up with a yawn （呵欠）and stretch . Sit on the edge of the  bed a minute before putting your feet on the floor . Avoid the troublesome search for clean clothes by laying them out the night before . Whenever possible , do routine （常规的）work in the afternoon and save tasks requiring more energy for your sharper hours .