Here's something we all know - but too often forget:
If your words say one thing and your delivery says the opposite, your audience almost always believes your delivery.
Watch the song "Stay Awake" from Mary Poppins, and let it serve as a gentle reminder of this principle:
From the Green Room: Synthesize your content and your delivery. If your words are meant to inspire and awaken, and your message doesn't match, you just might end up (in your case, unintentionally) putting your audience to sleep!