The Effects of Sleep Stages on Memory

I feel like in the last 10 years people know more about sleep than they probably ever have because of like the watches and the phones. So I was wondering if you could tell us a little bit more about that research. What we often think about is sleep in stages and these stages we use kind of these categorical definitions or we characterize sleep in these categorical ways but the most important thing to know is that this is really just a change and a shift in the neuronal firing rates in the brain.