content: In terms from the video, when you fall asleep (lose consciousness) that unmeasurable part of you that is your consciousness goes away. When you wake up, it comes back. Where does it go? Does it cease to exist? (Which is a pretty neat trick for something that can't be measured...) When it comes back, is it the same consciousness? This is far less troubling if you are a poor sleeper, since the days tend to carry into each other.