Daughter says ceiling comes down and floor comes up when she is laying in bed, any ideas why?

When my four-year-old is laying in bed she says the floor feels like it is coming up and the ceiling is coming down. She does not do this other places. She also tells us that when we are standing by her bed that we look too far away, again not something she says other times. She has no other symptoms like dizziness or headache, and we have tested her vision by having her focus on things and read to us. We know she sometimes exaggerates but this one is recurring, so we are wondering what could be wrong. Anyone have any ideas?