Dizziness, generalized weakness, want to sleep, need to consider the following situations: 1, the elderly appear dizziness, generalized weakness, want to sleep is the cerebral arterial blood supply is insufficient, the cerebral arterial blood supply is insufficient patients will appear dizziness, and even have fatigue, lethargy, and other aspects of the symptom; 2, mainly in some of the old age of neurological degenerative diseases, such as dementia in early Alzheimer’s disease, Parkinson’s disease can also appear in the phenomenon mentioned above; 3, the blood System, such as anemia patients will feel fatigue, weakness, dizziness and other phenomena, while more sleepy; 4, heart problems, such as heart failure, cardiac function is not good will also appear in the above phenomenon; 5, there are some mental, psychological factors, such as depression patients can also appear in the above symptoms.