The Promised Messiah (as) advises:
“Get up at night and supplicate that Allah the Almighty may guide you to His path. The companions of the Holy Prophet (sa) also received their training step by step. What were they before? They were like a seed sown by a farmer. The Holy Prophet (sa) in turn watered and prayed for it. The seed was healthy, and the soil was fertile. With watering, it yielded excellent fruit.
“They walked the path of the Holy Prophet (sa) without hesitation. They did not wait for day or night. You should repent with a true heart. Wake up for tahajud. Straighten your hearts. Leave your weaknesses, and make your words and deeds correspond to the will of Allah the Almighty.” (Malfuzat, New Edition, vol. 1, p. 28)
He adds that:
“Our Jama‘at should make it incumbent upon itself to offer tahajud. Anyone who cannot do more should make a minimum two rak‘at because he will get an opportunity to make some supplications. Supplications made at this time have a very special characteristic because they are offered with true pain and eagerness. Until there is a special pain and heartfelt agony, how can one wake up from comfortable sleep?
“To wake up at this time creates a heartfelt pain, which creates a condition of devotion and distress, which in turn becomes the means of acceptance of supplication. But someone who is lax in waking up is obviously lacking in pain and anguish. But one who wakes up, obviously there is a pain that is waking him up.”
(Malfuzat, new edition, vol. 2, p. 182)