It is narrated from Sayyiduna Abu Malik al-Ash'ari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Any man who wakes up at night and wakes his wife, and if sleep overcomes her he sprinkles water on her face, and then the two of them stand in their house and remember Allah, the Mighty and Majestic, for an hour of the night, they will both be forgiven."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3435