As for what Muhammad bin ‘Ali bin Mahbub narrated, from Al-‘Abbas, from Muhammad bin Isma‘il, from Muhammad bin ‘Udhafir, from Abdullah bin Sinan, from Abu Abdullah عليه السلام: (I asked) concerning a man, does his ablution (wudu’) break if he sleeps while sitting? Imam عليه السلام said: "If it is on Friday in the mosque, then he does not need to perform ablution, because it is a situation of necessity."