George Bernard Shaw said: "The fact that a believer is happier than a skeptic is no more to the point than the fact that a drunken man is happier than a sober one."
Hmmmmm. The only difference is that we're fully and consciously aware of our happiness. Oh, and our "happiness" doesn't leave in the morning, either.
Proverbs 19:23
The fear of the LORD tendeth to life: and he that hath it shall abide satisfied; he shall not be visited with evil.