Whoever wakes up whilst sleeping he should recites the following: La ilaaha illallahu wahdahu la sharika lahu lahul-mulku wa lahul-hamdu, wa huwa a’la kulli shay’in qadeer, alhamdulillahi wa subhanallahi, wa la ilaha illallah, wallaahu akbar, wa laa hawla wa laa quwata. And then he says: Allaahumagh-firlee and seeks forgiveness from Allaah or he supplicates, his du'a is accepted and he gets up and makes wudhu and prays then his prayer will also be accepted.

 

Narrated by Ubaadah ibn Saamit (RadhiAllaahu Anhu) [Ref: Bukhaari, Abu Dawood, Tirmidhee, Saheeh al-Kalim at-Tayyab]