学进去

Most of us use alarm clocks to wake up at the right time for work. We look at our w1．to know when to catch a bus or train. However, there is also a right time to eat, sleep, exercise, and take medicine, too. We can't look at a clock for the right time for these activities. We must listen to the clock inside our b2． our biological clock.

Today, doctors are learning more about chronobiology (生物钟学), the study of biological clocks. They are learning about the i3．of time for our bodies. For example, it is best for people to go to sleep at the s4．time every night and to eat only when they're hungry. Also, doctors have discovered that some i5．, such as heart attacks, occur most often in the morning. This information tells them that the b6．time to take heart medicine may be at night. When patients take heart medicine at night, they may prevent a heart a7．in the morning.