Nope. I lie down quite often. When I'm not standing or sitting I'm lying. It's good for you, too. George Bernard Shaw said "I never stand when I can sit. I never sit when I can lie down," and he lived to over ninety!
Oh, you mean telling fibs? Untruths? I think we're all subject to that, whether consciously or not. No, I doubt it's possible to live without the slightest lie.