Ok. inhale
Steins;Gate.
My personal #1 favourite. It's about time travel, floppy bananas, and Kurisutina. BUT! The amount of talking, especially in the first 10 episodes might put you to sleep faster than an angel with the gentlest voice singing you lullaby.

Monogatari Series.
A long series tagged with "supernatural" and "vampire", also labeled violent, that rely heavily on its narrative and character development rather than exciting action. BUTT!! This one might put you to sleep even faster than Steins;Gate.

These two are my favourites up until now that I rewatched not too long ago, but if you have any doubt, just watch Attack on Titan... .