The point of sleeping in coffins?

I've got a feeling that was the case in Stoker's novel, although I can't swear to it (it's many years since I read it). More recently I read Sheridan Le Fanu's Carmilla (used by Hammer as the basis for The Vampire Lovers), and in that Carmilla sleeps in a coffin that has about a two-inch depth of blood in the bottom!

I've never read IWTV, sorry.

Oh, that was so Dracula could leave Transylvania and go to other places, like England. If he hadn't taken some of the soil his coffin had first been buried in, he would have been trapped in Transylvania and not able to track down Mina Harker. It as one of those "find a loophole in the magic rules" kinda thing.

The concept of vampires sleeping in beds and just blacking out the windows was only thought up very recently in pop culture. Most books, movies, and tv shows like to follow tradition in where a vampire sleeps, as a way of defining them as a supernatural creature.

I only recently heard about the blacking out of the windows thing from a silly novel trilogy about an online influencer (who was always getting into trouble) who got turned into a vampire herself and ended up shacking up with the real Dracula in New Orleans. They were called "Dating Dracula," "Loving Dracula," and "Marrying Dracula," by Kinsley Adams.