four year old 我愛你 translation troubles

When I put Hannah to bed I try to keep the same bedtime routine.  We put on jammies, potty, brush teeth, floss, and then get tucked into bed.  I tell her, "Night night.  I love you.  Wo ai ni!"  One night as an afterthought I asked Hannah what wo ai ni means.  She responded, "It means go to sleep!"  I cracked up so hard.  It means "I love you!" not "Go to sleep!"  Hahaha!