The sorrow of separation has dragged us, lifeless and spent; we strike the head, meaning, now we, too, have fallen asleep.

This poignant couplet describes the exhaustion that comes from prolonged longing (Hizraan). The poet feels so drained by the separation that his life force is nearly gone. The second line, 'Hit me, strike me,' is not a plea for pain, but a resigned declaration that he has finally succumbed to sleep—a sleep that signifies a surrender to the pain, or perhaps, a temporary escape from reality. It's a beautiful depiction of emotional fatigue.