The Dawn

The sunrise, a beauty to behold the colors of the lingering night to give way to the brightness of the sun giver of life to all creatures of God... but kindred are not creatures of God they are forsaken and so the life giver turns into a harvester of undeath.

Every vampire needs to find refuge from the harmful rays of the sun, and to rest for the coming day, when dawn approaches all kindred start to feel Sluggish and impaired in their movements until they find a place to rest, similar to mortal sleep, kindred need to rest for the duration of the day, but the rest is different than mortal rest. Vampires enter a catatonic state where they rest until dusk, unable to move or take actions while in this state, it is when they are more vulnerable.
When in the sleep vampires regenerate damage made to them and regrow limbs lost depending on the severity of the injuries.

The sleep is different than Torpor, Torpor lasts for centuries while the Sleep last only until the last rays of light are extinguished, many kindred dont sleep in a coffin, its too Cliche yet many still seek the comfort of laying in a closed coffin with no danger on being burned by sunlight for not closing the blinds in ones room.
The sleep is indeed something paranormal unlike humans that can go days on end without rest Kindred can indeed decide not to sleep but they get no nourishment from feeding the blood no longer sustains them and so slowly but surely will drive kindred into the hands of the Beast, and the vampires senses are sluggish and the feeling of being incredibly tired is always about until one rests.
No kindred should go without the daily rest unless it is to save ones self from Hunters or another pressing matter.