Commentary for Psalms 77:5

You held fast the awakenings of my eyes Heb. שמרות, an expression of the watch (אשמרת) of the night, for [when] a person awakens from his sleep his mind is settled and his heart returns to him, but I am not like that. In this night of exile, my eyes are always stuck together, like a man sleeping from a clogged heart, and in the troubles that I see, my spirit throbs and I have no speech within me.