What Invalidates Wudhu.

325. Wudhu becomes void on account of the following seven things:
Passing of urine; excretion; passing wind from the rear; a sleep, deep enough to restrict sight and hearing. However, if the eyes do not see anything, but the ears can hear, Wudhu does not become void; things on account of which a person loses his sensibility, like insanity, intoxication or unconsciousness; Istibra - which will be dealt with later; every state which requires Ghusl, like Janabat.