Dua on waking up
الْحَمْدُ لِلّٰهِ الَّذِي أَحْيَانَا بَعْدَ مَا أَمَاتَنَا وَإِلَيْهِ النُّشُورُSahih al-Bukhari 6312
Transliteration: Alhamdu lillahil-ladhi ahyana ba‘da ma amatana wa ilayhin-nushur
Meaning: All praise is for Allah, who gave us life after He caused us to die, and to Him is the return.
When to say it
Say it the moment you wake, before you rise from the bed. Sleep is described in the hadith as a lesser death, and waking as a lesser resurrection — the words place the whole day that follows in the hands of the One who returned it to you.