There are many rewards for praying this night prayer. It is mentioned in this Hadith:
Abd Allah ibn Salam (Allah be pleased with him) reports that the Messenger of Allah (blessings and peace be upon him, his family, and companions) said, “O people! Spread the salams, feed others, maintain family ties, and pray at night when others sleep and you will enter Heaven safely.” [Tirmidhi]
The scholar reminds us to wake up for tahajjud prayer consistently. It is better for us to take up 5 or 10 minutes before fajr regularly than to pray for one whole hour irregularly.
Another tip is to go to bed early. In the winter months in the west it is very easy to go to bed as Isha pray is so early in the day. Make this a habit and not only will you see the rewards of tahajjud but it will make your whole day productive.