This varies from person to person. Some people like to have a cup of coffee in the morning or afternoon, but they can still sleep well at night. Some people are sensitive to coffee and have slow metabolism. Drinking coffee in the afternoon will make it difficult to sleep at night. At this time, it is necessary to persuade him not to drink coffee in the afternoon, but to change the time of drinking coffee to morning, especially for some people who drink coffee at night, which is more likely to cause insomnia. Patients with insomnia after drinking coffee in the afternoon can consider taking a small amount of coffee. If a small dose of coffee can cause insomnia, then avoid drinking coffee in the afternoon.