Sleeping is a very healthy thing for humans to do as they do it every night once they were finished with either school or work 24 hours a day, when the only solitude they could get is from there dreams they have. However, sleeping could also lead to the sin, named after the same lazy succubus who makes it, Sloth.
Whenever it's late at night, have you ever wondered why most people at adult age have a hard time trying to fall asleep, without sleeping pills, night-lights, or even a glass of milk? Well thanks to the sin of Sloth, people find it hard to make them sleep, as the causes of these were sometimes insects flying in their face, loud noises, and bright lights. Even if none of those distractions are around to keep anyone awake, Sloth is still able to keep them up with whatever she has.