Narrated ‘Ubada bin As-Samit:
The Prophet said, “Whoever gets up at night and says: — ‘La ilaha il-lallah Wahdahu la Sharika lahu Lahu-l-mulk, waLahu-l-hamd wahuwa ‘ala kullishai’in Qadir. Alhamdu lil-lahi wa subhanal-lahi wa la-ilaha il-lal-lah wa-l-lahu akbar wa la hawla Wala Quwata il-la-bil-lah.’ (None has the right to be worshipped but Allah. He is the Only One and has no partners . For Him is the Kingdom and all the praises are due for Him. He is Omnipotent. All the praises are for Allah. All the glories are for Allah. And none has the right to be worshipped but Allah, And Allah is Great And there is neither Might nor Power Except with Allah). And then says: — Allahumma, Ighfir li (O Allah! Forgive me). Or invokes (Allah), he will be responded to and if he performs ablution (and prays), his prayer will be accepted.”
If you’re getting up for Tahajjud at night, awesome. Say these words, make du`a and earn lots of hasanaat (good deeds). Plus, the bonus of getting your prayers accepted. (y)
If you’re not getting up, no problem. There’s still a way to earn this bonus. Memorize these words:
La ilaha il-lallah Wahdahu la Sharika lahu Lahu-l-mulk, waLahu-l-hamd wahuwa ‘ala kullishai’in Qadir. Alhamdu lil-lahi wa subhanal-lahi wa la-ilaha il-lal-lah wa-l-lahu akbar wa la hawla Wala Quwata il-la-bil-lah. Allahumma, Ighfir li.
If it so happens that your sleep gets disturbed at some point, or you suddenly wake up at night, just recite these words out of your memory, make a small du`a and go back to sleep. Ta da! =D
And if you’re really desperate, you can put up an alarm on your phone for this purpose, provided it is easy for you to go back to sleep after getting disturbed. If not, well get up and pray Tahajjud. :P