If one goes to bed early on the first night, for example, around nine o’clock, and wakes up at 4:30 the next morning, the length of sleep has reached seven hours, which is normal. If you go to bed late, for example, at eleven or twelve o’clock at night, and wake up at four-thirty in the morning, and you can’t go back to sleep after waking up, it is considered early waking up, which is a kind of sleep disorder. If it affects the daily work during the day, for example, after waking up at 4:30 in the morning, the spirit is poor during the day, always wanting to go to sleep, with a feeling of drowsiness, it belongs to insomnia. There are many reasons for this, most of which may be related to adverse events in the work life, or may be related to depression. There may also be a lack of exercise during the day, or lack of sunlight, the body’s hormone that promotes sleep is melatonin may not be enough secretion. It is recommended to take drugs to assist sleep, such as alprazolam, eszopiclone, dexamethasone and so on.