causes of yawning all the time
Excessive yawning is caused by a decrease of oxygen levels in the blood. It is often associated with boredom or a lack of sleep or fresh air. Yawning is considered excessive when it happens more than one time per minute.
Excessive yawning, caused by sleepiness, can be counteracted by drinking lots of water. Dehydration is a big cause of fatigue. When a person drinks a lot of water, the yawning will cease. Every time the urge to yawn is strong, drink a big gulp of water and the yawn will pass.