I didn't respond earlier, because I don't have yawning attacks. I just relax very easily. So I almost always have a few yawns when I start active or sitting meditations, shortly after closing my eyes.
After TobyEL's post on trying to keep her tongue pressed to the roof of his mouth, I remembered I always just give right into my yawns. I was conscious of breaking the circuit but I just let it go and reconnected. So this morning I tried to keep my tongue connected. Whoa, that makes for a yucky yawn.
After about twice as many yawns as normal (6 instead of 3) I gave into a good deep broken contact yawn. After that, the urge was gone.
Just sharing.
You are perfection.
Iam2 
P.S. Toby I spent about a minute with that personal pronoun, trying to keep it gender neutral, then said ah go ahead Toby is a male name.... Wrong. 
[This message has been edited by Iam2 (edited October 24, 2003).]