While a daily low-dose aspirin can slash the risk of heart attacks and strokes in those with an elevated risk, it can also cause dangerous bleeding in the stomach and intestines. Drugs called NSAIDs, which include ibuprofen (Advil and generics) and naproxen (Aleve and generics), can magnify that risk.
Yawns can be caused by boredom. When watching an uninteresting performance, movie, or recital a person may have a bout of excessive yawning. To suppress the yawns, he can hold his mouth closed tightly and clench his jaws. When the yawn comes on he must keep the pressure in the rear of his jaws and swallow the yawn. 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.
The evolution theory: Some think that yawning began with our ancestors, who used yawning to show their teeth and intimidate others. An offshoot of this theory is the idea that yawning developed from early man as a signal for us to change activities [source: University of Washington]. The boredom theory: Although we do tend to yawn when bored or tired, this theory doesn't explain why Olympic athletes yawn right before they compete in their event or why dogs tend to yawn just before they attack.