Aboo Sa'eed al Khudree (radhiyallaahu 'anh) narrated:

The Messenger of Allaah (sallal Laahu 'alayhi wassallam) said:

"When a man wakes his wife in the night and they both observe two rak'aat together, they would be counted among those who remember Allah a lot"

- Saheeh Abee Daawud #1181, #1182.