Just had to post about the funniest thing thats happened to me so far. Last night i maxed enchanting and made a bow for my follower with chance of paralysis and stamina damage (maxed enchanting so dual enchants).
Today fighting a blood dragon it takes off into the air...as usual..and starts to do one of its fire strafing runs...but then as it starts i notice its coming in low and fast...and its wings aren't flapping. It procedes to nosedive into the ground and sit there. I thought it died but no it still has a health bar and eventually gets up. Thats when i realized Either paralysis can work on dragons or their flight is somehow stamina based. But it was funny as hell when it happened.

So...if in flight dragons annoy you a paralysis bow may help...I have to give it to my followers since i can never hit flying targets with bows or spells.

I had an Ice dragon crash land but i think it was because his health got down to 25% not that anyone used paralysis on him.

The first time this happened, I noticed an odd thing - the terrain actually changed when the dragon landed, being pushed away from where the dragon landed and upwards at other points along the mountaintop we were fighting on. Very cool, but a little weird graphics-wise. Also, the idjit crashed into the side of the mountain and then couldn't get back up:D