Brahma Sutras
ॐ सुषुप्त्युत्क्रान्त्योर्भेदेन ॐ ॥ १-३-४२॥
Because of the declaration of being different in sleep and at the time of departure, (the supreme Lord is the subject-matter of teaching).
english translation
OM suSuptyutkrAntyorbhedena OM ॥ 1-3-42॥
hk transliteration by Sanscript