People usually spend 1/3 of the day and night sleeping, i.e., they go to sleep at night and wake up during the day, forming a sleep-wake rhythm. Sleep-wake rhythm disorders are sleep disorders caused by a sleep-wake rhythm that is different from the usual one. The disorder is usually seen in adults, but is rarely seen in childhood or adolescence. The most important way to understand sleep is to use EEG multilead tracing device to monitor the whole night sleep process, because there are different reasons for the complaints of sleep-wake time disorder, and EEG multilead tracing is essential for accurate diagnosis. NPSG is most suitable for the evaluation of endogenous sleep disorders such as obstructive sleep apnea syndrome and periodic leg movements or frequent deep sleep states such as REM behavioral disorders or nocturnal head movements, but it is not useful for the evaluation of insomnia, especially those with difficulty falling asleep. MSLT is often performed after NPSG for the evaluation of hypersomnia, and the method often reveals excessive daytime sleepiness and early REM periods in episodic sleeping sickness. MSLT should be performed during the patient’s normal waking cycle and followed by observation of a normal nighttime sleep. On the basis of history taking and focused neurological examination, other necessary selective ancillary tests include: 3. CT and MRI 4.Blood routine, blood electrolytes, blood glucose, urea nitrogen. 5.Electrocardiogram, abdominal ultrasound, chest X-ray.