The earth is a big magnetic field with north and south magnetic poles. At the same time, the human body itself is also a small magnetic field. But the earth's big magnetic field has an ever-present influence on the human body's small magnetic field, just like repulsion and opposite attraction. In recent years, according to the investigation of sleep orientation in medical circles at home and abroad, if the head faces north or south, the health will be affected to some extent. In the investigation of cerebral thrombosis, the medical profession found that the incidence rate of elderly people sleeping in the direction of head, north foot and south foot was higher than that in other directions. This statement is by no means alarmist. The author has also investigated this subject in clinical work, and the conclusion is that most teenagers are slow to respond to this problem, while middle-aged and elderly people, especially the elderly, are more sensitive to this problem. Nearly 60% of the elderly feel that they have insomnia, dreaminess and fatigue after sleeping in the north-south direction, and a few will feel flustered and short of breath during sleep. But strangely, when the bed is adjusted to the east-west direction or close to the east-west, the above symptoms will get better. Therefore, when you feel that you are not sleeping well, you may wish to consider the placement of the bed. Because the bed placement is appropriate, it will directly affect sleep health.