"And the Lord God caused a deep sleep to fall upon Adam."
"And the rib, which the Lord God had taken from man , made He a woman, and brought her unto the man." (Gen. 2.:22)
When Adam woke up & saw Eve, he thought, "Wow! Halleluiah! This is like me! This is what I was waiting for all the time!"
Then they've heard the voice of God, "Be fruitful & multiply"...