When waking up
The Prophet (SAW) said: "Whoever awakes at night and then says:
لا إلهَ إلاّ اللّهُ وَحْـدَهُ لا شَـريكَ له، لهُ المُلـكُ ولهُ الحَمـد، وهوَ على كلّ شيءٍ قدير، سُـبْحانَ اللهِ، والحمْـدُ لله ، ولا إلهَ إلاّ اللهُ واللهُ أكبَر، وَلا حَولَ وَلا قوّة إلاّ باللّهِ العليّ العظيم
...and then supplicates:
رَبِّ اغْفرْ لي
Al-Waleed said, "or he (SAW) said: "and then asks, he will be answered. If he then performs ablution and prays, his prayer will be accepted."
None has the right to be worshipped except Allah, alone without associate, to Him belongs sovereignty and praise and He is over all things wholly capable. How perfect Allah is, and all praise is for Allah, and none has the right to be worshipped except Allah, Allah is the greatest and there is no power nor might except with Allah, The Most High, The Supreme. O my Lord forgive me.