Fikh- Urine effects on mattresses on our clothes.

I sleep on the bed that was dry. Are stool will about my clothes?

If his body or clothes wet, then the stool will be moved from the stool to his body or clothing. Similarly, if the feces hit the mattress wet, then it can stain his body.
This is in accordance with popular method that is often referred to by scholars:
"Dry met dried will not defile without dissent scholars".

Al Ustaz,Issue 18