I don't know about you lot, but sometimes I yawn. Now we all know we yawn in times of tiredness, boredom and lack of sleep. But I want a few questions answered about these perculiar involuntary human actions. Firstly, why do we yawn? Taking into account the times we do it, I can only think it's the brains desperate attempt to inhale a large amount of oxygen to keep us awake? Let me know. Secondly, when I do yawn, I don't just yawn once, I yawn every 30 seconds, and sometimes belive it or not I can get annoyed with it, but that's another question for someone else. Finally, whenever I SEE the word 'yawn', I yawn. Whenever I HEAR the word 'yawn', I yawn, and more importantly, when I see or hear a yawn, I yawn. In fact, I think a good 20% of you reading this, will yawn. What is this contagiousness all about?

Thanks in advance.

Sam :)

There’s a particular type of tiredness when one’s eyes seem so tired that one just has to shut them – not just to blink and lubricate them, but keep them shut.

Is the physical action of bringing down the eyelids the critical factor, or does the removal of vision also contribute?

What would happen if one had the bulk of the eyelids removed or made transparent? Would the closing action then still satisfy?

I visited the local swimming pool today with my sisters. The majority of the time I was kneeling on the floor of the pool and supervising them. When I was in the pool I didn't feel as though I was doing much (if any) exercise, though on the way home I felt as though I'd done a lot more than usual. My muscles didn't ache but I felt very drained of evergy and rather hungry.

Can anyone explain why this happened?

Thanks in advance.

I train 10 times a week as a competitive swimmer but I have thee weekend off. When I return on a Monday Morning I feel really bad. I also build up a lot of lactic acid during the week in the pool as I am quite muscular.

Why is it? and could someone suggest some ways of helping me? thanks.