Sayyiduna Abu Sa'id and Sayyiduna Abu Hurayrah (may Allah be pleased with them both) narrate that the Messenger of Allah (peace and blessings be upon him) said: "Whoever wakes up at night and wakes his wife too, and they both pray two rak'ahs together, they are both recorded that night among the men and women who remember Allah much."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4645