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 labor through your work you may say that you are“hot”. That’s true. The time of day when you feel most energetic（精力充沛的）is when your cycle of body temperature is at this peak（高峰）.
