Ramayana
तं शयानं नरव्याघ्रं निद्रा नाभ्यागमत्तदा । चिन्तयन्तमनेकार्थं रामगीतमनुत्तमम् ॥ 7-72-1 ॥
As that tiger among men lay down, sleep did not come to him then, for he was pondering over the many meanings of that incomparable song of Rama.
english translation