I know it's wrong - God, it's all kinds of wrong - but I just want to lie down with you and wake up with you, just once, just once ever in my life.

This quote is expressing a strong desire for intimacy. The speaker wants to experience the feeling of being close to someone they care about. They acknowledge that what they are asking is wrong, but they still want it: to be able to just lie down with someone and wake up with them, even if it’s just once in their life.