The Holy Prophet (Sallallahu alaihi wa sallam), who knows the sorrows of the Ummah, has given glad tidings of great reward on small deeds. He has encouraged the Ummah to enliven their nights with worship and prayer and has made clear the importance of doing so:
Translation: It is narrated on the authority of Hadhrat ‘Abdullah bin ‘Umar (May Allah be well pleased with them) that the Holy Prophet (Sallallahu alaihi wa sallam) said: 2 Raka’at that a slave offers in the last part of the night are better than the world and all that it contains. If I didn’t fear of this being hard on my Ummah, then I would certainly have made this 2 Raka’at obligatory on them. (At Targheeb Fee Fadhaail Al A’amaal Li Ibn Shaheen, Hadith No. 559)