The first idea brought up in the talk falls under the “restoration” concept of why we sleep, the second is “energy conservation” and the third is “memory consolidation.” When discussing the restoration concept, this is the theory that we restore what we burn up during the day. This goes back to the Aristotle age, and has been backed up by modern researchers who have connected certain genes which turn on during sleep in order to perform certain functions to restore what we lost during the day. Energy conservation refers to restoring energy which we lost, though this idea is not very supported due to the fact that on average we only restore about a hot dog bun worth of calories when we sleep which is quite minimal. When discussing memory consolidation or brain processing, this is the most convincing because if you are sleep deprived and you learn a task, it becomes a lot harder to learn overall. When getting a good amount of sleep, this actually enhances our creativity as well as our ability to solve complex problems. This happens due to the fact that those neural connections in our brain become strengthened when we sleep, thus improving our memory of those skills and enhancing our ability to recall them.