The Prophet (ﷺ) said: when one of you wakes up, he should say:

اَلْحَمْدُ لِلَّهِ الَّذِي عَافَانِيْ فِي جَسَدِيْ، وَرَدَّ عَلَيَّ رُوحِيْ، وَأَذِنَ لِي بِذِكْرِهِ

Alhamdu lillaahil-ladhee 'aafaanee fee jasadee, wa radda 'alayya roo’hee, wa 'adhina lee bidhikrih

Praise is to Allah Who gave strength to my body and returned my soul to me and permitted me to remember Him.

Reference: At-Tirmithi 5/473. See Al-Albani's Sahih Tirmiihi 3/144