When you fall asleep, the consciousness you know as 'you' dies, and a recreation of it is born the next day based upon the sum of your memories. This is why it takes time to get over things, because all memories are recycled and diluted and some people really don't like sleep. Every night as you finally 'drift off' that's the last memory your brain has from that consciousness, as it dies and your brain generates a new consciousness to guide the body. Your consciousness finally understanding this truth only when it's too late, in that very moment, aware that you're going to die every time you sleep until the day that you die.