One of the qualities of the good Muslim wife is that she helps her husband to obey Allah (subhaanahu wa ta’aalaa) in different ways, especially in waking him up to pray at night (qiyaam al-layl). By doing this, she does him an immense favor, because she reminds him to do something he might otherwise forget or neglect. Thus she causes him, and herself, to be covered by the mercy of Allah.
What a beautiful picture the Prophet (peace and blessings be upon him) drew of the married couple helping one another to obey Allah (subhaanahu wa ta’aalaa) and do good deeds, and entering into the mercy of Allah (subhaanahu wa ta’aalaa) together. This comes in the hadeeth narrated by Abu Hurayrah (may Allah be pleased with him), who said, The Messenger of Allah (peace and blessings of Allah be upon him) said,
‘May Allah have mercy on the man who gets up at night to pray and wakes up his wife to pray, and if she refuses, he sprinkles water in her face.
And may Allah have mercy on the woman who gets up at night to pray, and wakes her husband up to pray, and if he refuses, she sprink les water in his face.”
(Reported by Abu Dawud, 2/45, in Kitab al-salah: bab qiyam al-layl, and by al-Hakim 1/309, Kitab salah al-tatawwu'; he said that it is sahih according to the consitions of Muslim.)