Here's why it's hard to say for sure:
* No direct source: There's no documented evidence from Poe himself or his contemporaries about his sleeping habits. The anecdote may be an embellishment or a myth.
* Different interpretations: Some believe the facing north part is a symbolic gesture, representing Poe's melancholic nature and seeking solace in the direction of the unknown.
* Folklore and legend: Many stories and myths have developed around Poe's life and work, and this might be one of them.
While it's a fascinating anecdote, it's important to remember that it's likely not based on fact.