Is not invalidating
According to Shafiis, wudu is invalidated when the skin of a woman and a man touches each other.
As for the leakage other than blood, pus and yellow liquid, they will invalidate wudu if they leak due to an illness.
For instance, tears that flow due to crying or laughing a lot or running of the nose due to cold weather will not invalidate wudu.
Pure water coming out of the pimples on the body is like blood and invalidates wudu according to a view. The second view is a great ease for those who have scabies and pockmarks.
Napping does not invalidate wudu if the person hears what the people around are talking. Smiling does not invalidate the prayer or wudu since it is silent.
When a person sleeps leaning on something, if he sleeps so deeply as to fall when the thing that he leans on is moved away, his wudu is invalidated. However, if a person laughs so silently and if he himself hears it only, his prayer is invalidated but his wudu is not.