When people are sleepy, they will yawn habitually. But sometimes, people yawn for no reason. What causes this? A British study found that yawning may also be related to the brain. Compared with humans, animals yawn longer. What are the reasons for yawning?
1. Yawn for no reason every day, and look for the door carefully. People sometimes unconsciously yawn, but how to yawn frequently may be the cardiovascular disease, especially the elderly, in this case, we must go to the hospital in time.
2. Yawning is contagious. If you have a friend or colleague who likes to yawn, your yawn may be transmitted to you by him.
3. Frequent yawning may be the precursor of endocrine disorders, especially in female physiological period, if yawning lasts for days, you may have endocrine problems.
4. In addition, yawning often without any reason may also be the risk of hyperlipidemia, cardiovascular disease and cervical spondylosis. In a word, yawning is related to the lack of oxygen and blood supply of brain. Sometimes, yawning is more likely to be simply tired. When you need to rest, you should remember to rest and don't stay up late.