1. Reversed Sleep: Many people stay up late due to work or other reasons, causing their sleep schedule to be disrupted and their circadian rhythm to be out of sync. This can lead to physical and mental health issues, such as insomnia and depression.

2. Coffee Sleep: Drinking coffee, especially in the afternoon or evening, can make it difficult to fall asleep due to the stimulating effect of caffeine.

It is recommended to avoid coffee consumption four to six hours before bedtime. 

3. Drunk Sleep: Sleeping immediately after consuming alcohol can negatively affect liver function and even lead to alcohol poisoning. It is important to rest and drink water before going to bed after drinking alcohol to prevent potential health risks.

4. Qi Sleep: Fatigue, drowsiness, and dizziness are often signs of poor blood circulation. Adequate sleep plays a crucial role in maintaining good blood circulation and overall health.