Strange Tales #122 Jul 1964
"The World Beyond"
Weary from his struggles against supernatural forces, Strange falls asleep, carelessly
forgetting to cast a protective spell over himself and becoming a prisoner of the Nightmare World!;
Nightmare imprisons Strange, the only human who has ever defeated him, then says he's bored and looks forward to other victims;
Strange summons The Gulgol, a creature that never sleeps.
Script by Stan Lee and Steve Ditko (co-plot),
pencils by Steve Ditko,
inks by George Roussos