As revealed in the hadiths, in the time of Hazrat Mahdi (as), nobody’s nose will bleed, nobody will get harmed and even a sleeping person will not be awaken. This also shows that Hazrat Mahdi (as) will wage an intellectual struggle. Hazrat Mahdi (as) will intellectually silence movements and systems incompatible with the moral values of the religion, and will establish the global dominion of Islam with his scholarly activities.
In the time of [Hazrat Mahdi (as)] no one will be woken up from his sleep or have a bleeding nose. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 42)
Hazrat Mahdi (as) … will walk in peace. (Al-Barzanji, Al-Isha'ah li-ashrat al-sa'ah, p. 173)
[Hazrat Mahdi (as)] will follow the way of the Prophet (saas). HE WILL NOT wake up a sleeping person or shed blood. (Al-Barzanji, Al-Isha'ah li-ashrat al-sa'ah, p. 163)