It was authentically reported from the Prophet (peace be upon him) different types of Adhkar (invocations and Remembrances said at certain times on a regular basis) which are permissible for a Muslim to recite upon waking up from sleep. In general, these Adhkar contain the testimony of faith, seeking refuge against the cursed Satan, and praising Allah (Glory be to Him) for protecting a person and helping him for obedience and Dhikr.
Of these Hadiths what was reported by Al Bukhari in his Sahih on the authority of `Ubadah ibn As-Samit (may Allah be pleased with him) that the Prophet (peace be upon him) said: "Whoever wakes up at night and says: La ilaha illallahu wahdahu la sharika lahu, lahul mulku wa-lahul-hamdu wa-huwa ala kulli shay'in qadir. Wa-subhan allahi wal-hamdu lillahi wa-la ilaha ilallallahu wallahu akbaru, wa-la hawla wa-la quwwata illa billah. [There is no (true) god except Allah Alone, without any partners. To Him belongs the sovereignty; to Him belongs all praise. He is capable of everything. Exalted is Allah; Allah is the Greatest, there is no power or might except from Allah." and then says: "Rabb ighfir li" - "My Lord! Forgive me." Anyone who says this and supplicates, he will be answered, and if he performs ablution and offers Salah, his Salah shall be accepted]. [Sahih Al Bukhari No. (1154)].
The Hadith shows the excellence of promptness to mentioning Allah (may He be Glorified and Exalted) and praising Him upon waking up from sleep and urging a person to make Adhkar the first thing to do when he wakes up. This is confirmed for a person who loves Dhikr, got used to it, and became his frequent practice upon waking up and upon sleeping. If Adhkar is a usual practice, the first thing to do upon waking up is promptness to mentioning, glorifying, and thanking his Lord (Glory be to Him) with what He deserves, such a person will be answered when he asks and invokes Allah.
Ibn Battal (may Allah bestow mercy on his soul) said: "Allah promised on the tongue of His Prophet (peace be upon him) that whoever wakes up from sleep —pronouncing the testimony of faith, submitting himself to the dominion of Allah, acknowledging His Favors, glorifying Him, denying any defect attributed to Him, and submitting to Him through Takbir (Allahu-Akbar) and admitting weakness before His Ability— to answer his call and if he performs Salah, his Salah shall be accepted.
Anyone hears this Hadith should seize the chance and devote his intention to his Lord (Glory be to Him)." Fathul-Bary of Ibn Hajar (3/41).
The Prophet (peace be upon him) started these words with the testimony of faith "La Ilaha Illa Allah [There is no god but Allah]" confirming its meaning and the purport of his saying: "alone without any partners," because the statement "La Ilaha Illa Allah" contains two great pillars which are: negation and affirmation. Negation is in his saying: "No god" which negates lordship from anything other than Allah and affirmation in his saying: "but Allah" is for attributing lordship to Allah by all its means.
The Prophet confirmed these two commands by his saying: "alone without any partner." his saying: "alone," contains confirmation to affirmation. As for his saying: "He has no partner," it contains confirmation to negation. This is a proof to the importance of monotheism and advancing it to anything else, stressing the importance of understanding its meaning, applying and acting according to its meaning.
Then he said: "To Him belongs the sovereignty; to Him belongs all praise. He is capable of everything." These are the proofs of monotheism because the one who has the pure monotheism is the owner of the dominion, the one who deserves all praise who is capable of doing everything, whereas others do not deserve worship "Say: (O Muhammad peace be upon him to those polytheists, pagans) "Call upon those whom you assert (to be associate gods) besides Allah, they possess not even an atom's (or a small ant's) weight either in the heavens or on the earth, nor have they any share in either, nor there is for Him any supporter from among them." [Surat Saba': 22]. Then he said: "All praise be to Allah glory be to Allah, and there is no god but Allah, and Allah is the greatest."
So, he mentioned the four statements which are more desirable to Allah (may He be Glorified and Exalted) as was reported in Sahih Muslim from the Hadith of Samurah ibn Jundub (may Allah be pleased with him) that he said: The Messenger of Allah (peace be upon him) said: "The words liked most by Allah (may He be Exalted) are four. There is no harm on you in which order you begin (them while remembering Allah), they are: Subhan Allah (Glory be to Allah) Al Hamdulilah (praise be to Allah), La Ilaha Illa Allah (there is no god but Allah), Wallahu Akbar (and Allah is the greatest)." [Sahih Muslim No. (2137)].