Uthman bin Affan reported the Messenger of Allah (may peace be him) as saying; if anyone says the night prayer in congregation, he is like one who keeps vigil (in prayer) till midnight; and he who says both the night and dawn prayer in congregation is like one who keeps vigil (in prayer) the whole night.
Related hadith on this topic
Explanation & Benefits
Shaykh Umar Farooq Saeedi
555. Commentary:
And whoever, after performing these prayers in congregation, also stands (in prayer) during the night, his rank will be exceedingly high.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 555