"I came that you may have life, and have it abundantly." (John 10:10)
I think we are making this praying-for-the-X's-happiness thing too complicated.
If we truly approach it from a Christian perspective, what we are praying for is for that person to experience life in the fullness of God. Or to put it in more psychological terms, we are praying for them to reach the top of Maslow's Pyramid -- Hierarchy of Needs. We are praying for them to be fully self-actualized.
When one is living fully in God, sleeping with someone's W/H/D/S is irrelevant; that's not living fully and joyfully in God.
So don't overanaylze this stuff. If we pray to God for someone to be happy, God knows what we mean (or at least what we SHOULD mean!)
