Regular exercise can help you sleep well, but the time to do exercise is important. Exercising in the morning or early afternoon will not interfere（干扰）with sleep.

　　Have a snack before bedtime

　　If your stomach is too empty, that can interfere with sleep. However, if you eat a heavy meal before bedtime, that can interfere as well. Have a warm glass of milk.

　　Take a hot bath 90 minutes before bedtime

　　A hot bath will raise your body temperature, but it is the drop in body temperature that may make you feel sleepy.

　　56．If you want to have a good sleep at night, you can

　　.

　　A．take a bath before bedtime

　　B．sit quietly with the light on

　　C．read an uninteresting magazine

　　D．think over what happened in the day

　　57．According to the passage, one had better not take naps

　　.

　　A．before 3 p.m

　　B．for over one hour

　　C．when they are tired

　　D．when they have many things to do

　　58．What can we infer from the passage?

　　A．A lot of people have problems in sleeping.

　　B．Taking exercise before bedtime can help you sleep well.

　　C．The rise in your body temperature makes you feel sleepy.

　　D．Have a little food when you feel very hungry before bedtime.

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