It's a question I've groggily-asked on more than one New Year's Day...
...but here it's the title of an example of classic Ditko storytelling!
Most likely scripted by Joe Gill, this taut tale from Charlton's Out of This World #3 (1957) is one of those fun "gotcha" shorts in the vein of both EC Comics' sci-fi line and, later, TV's The Twilight Zone.
Have a safe and fun New Year's Eve, and be here tomorrow for the 50th Anniversary debut of Europe's Star Trek, Raumpatrouille – Die phantastischen Abenteuer des Raumschiffes Orion (or Space Patrol: the Fantastic Adventures of the Starship Orion)