Reference : Hisn al-Muslim 3

الحمدُ للهِ الذي
عافاني في جَسَدي
وَرَدّ عَليّ روحي 
وَأَذِنَ لي بِذِكْرِه
Al-ḥamdu lillāhil-ladhī 
`āfānī fī jasadī, 
wa radda `alayya rūḥī, 
wa 'adhina lī bidhikrihi.

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

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

Chapter: When waking up