Sleepers Awake
Cervantes was asleep when he wrote Don Quixote.
Joyce slept during the Wandering Rocks section of Ulysses.
Homer nodded and occasionally slept during the greater part of the Iliad; he was awake however when he wrote the Odyssey.
Proust snored his way through The Captive, as have legions of his readers after him.
Melville was asleep at the wheel for much of Moby-Dick.
Fitzgerald slept through Tender Is the Night, which is perhaps not so surprising,