Yawning is a natural reaction to tiredness or stress but when you start to yawn a lot and you can't stop, you might begin to worry. Excessive yawning may be caused by an underlying condition like sleep deprivation, insomnia, sleep apnea, narcolepsy, a condition that makes you excessively sleepy during the day. It could also be a symptom of a heart attack. If you feel you have been yawning excessively, it is advisable to consult a doctor to find out the underlying cause.
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