People in deep sleep are suddenly awakened by the alarm clock, will cause the body's protective conditioning reflex, the body's adrenaline level is rapidly increased, the heart rate is accelerated, the blood vessel systolic pressure is increased, long-term stimulation, is likely to lead to a series of sleep problems, and even lead to high blood pressure.Suggestion: The alarm clock is 1 meter away from the head, the mobile phone should not be the alarm clock, and the development of good sleep habits can wake up naturally。