The scholars agree that fainting is one of the things that invalidate wudu, even if it is brief. Whoever faints and loses consciousness, even for a moment, has broken his wudu.

If the sleep is light and the sleeper can feel it if he breaks his wudu, then sleeping does not break wudu whether the sleeper is lying down, sitting, leaning on something or sitting without leaning.

Touching the husband’s penis with desire invalidates her Wudu, but touching it without desire does not invalidate the Wudu. If a woman touches her husband’s penis with a barrier, her Wudu is not invalidated, even if it is with desire.

Touching the penis with desire invalidates wudu, but touching it without desire does not. Touching the buttocks does not invalidate wudu.

Some of the scholars said that if water (pus) from wounds is a small amount, it does not break wudu, but if it is a large amount then it does break wudu.

Passing wind breaks wudu but if a person passes wind continually, he has to do wudu for each prayer when he wants to pray, then if wind comes out of him whilst he is praying, that does not invalidate it.

The basic principle is that bleeding does not break wudu. Bleeding from any part of the body other than the vagina does not invalidate one’s wudu.