EVERYTHING ABOUT POWER OF TAHAJJUD PRAYER

"Verily, We despatched Noah to his people indicating, 'Alert your people in advance of there concerns them a unpleasant torment.'Then verily, I known as to them openly (aloud); then verily, I proclaimed to them in public, and I've appealed to them in non-public, I reported to them: 'Check with forgiveness from your Lord, Verily, He is Oft Forgiving