15 Best Alchemy Potions You Can Make In Skyrim Bethesda has more than one person working on each aspect of the game, and so we can't even say TES has a clear-cut lore on everything, Vampires included. In Skyrim, the Sun simply stops health regeneration.
In Oblivion the Sun inflicted damage to the point of death if you were unlucky. Well, every single person has their own lore about Vampires. It makes sense in that lore but we're talking about Elder Scrolls here, the laws or rules are a bit different for vampires in that instance. Well i remember that at least from Queen of the Damned when she or one of the vampires drank too much blood and they turned to stone or dead in this case. Also in that lore, a vampire can't drain the last drop of a victim or else they also take in that persons death and die.
If a Vampire feeds from a dead body, they take in that persons death into themselves and they die. That was in Anne Rice's 'Interview With The Vampire' when Lestat drank from a dead body and became weak enough to put him to sleep for centuries by Louis.