One of Imam's relatives narrates: Right from the time we used to live in Khomein, Imam from the age of 15 would recite Namaz-e-shab. So as not to wake anyone else at that time of night, Imam would use a small lamp to light his way. He would then go to a corner of the house and say his prayers.
Imam's wife would say, "I was never once woken up by Imam praying Namaz-e-Shab because he would never switch on the room light. When he would go do wudhu, he would place a sponge in the sink under the tap so that the sound of the falling water would not wake me.
(A memoirs by Mrs Naeemeh Ashraqi - Imam's granddaughter)