First of all, we should sleep late and get up early in the morning. The daytime comes early in summer so that people tend to wake up much earlier than usual. Therefore, we do not need to go to bed early in the night. But sometimes, there will be a problem. We may feel sleepy in the daytime. So doctors suggest us to take a nap at noon. They point out that the length of nap varies from people to people. In general, half an hour to one hour is appropriate. For people who do not have the habit of taking naps, listening music for thirty to fifty minutes can also help.