"Rasulullah Sallallahu 'Alayhi Wasallam once came home, a woman was present at that time. Rasulullah Sallallahu 'Alayhi Wasallam inquired. 'Who is this woman?' I replied: 'This is a certain woman who does not sleep at night'. Rasulullah Sallallahu 'Alayhi Wasallam said: 'One should observe only that amount of nawaafil which one can bear. I swear an oath that Allah Ta'aala does not fear the granting of rewards, till you begin to fear the observance of deeds'. 'Aayeshah Radiyallahu. 'Anha says: 'The most beloved deed of Rasulullah Sallallahu 'Alayhi Wasallam were those that were practised continuously.