For example, if we sleep late several nights. When we wake up, we can feel the dark page, body weakness, not strength, because the body is not enough relaxation, body not recovered.
For example, if we stay up late many nights. When we wake up, we feel dizzy, physical exhaustion, weakness. Because the body is not enough, the various systems in the body not recovered.
For example, if we sleep late every night. When we wake up, the body will feel faint, weak weak. Because the body relax, not enough. System in the body to recover in time.