And you cycle throughout so that you do about five to six cycles throughout the night. And we spend more time in REM later on in the night than we do earlier on.

So, sleep deprivation, and sometimes an insomnia, which is a little bit of a different form, but just getting a lack of sleep, can lead to a number of different decrements.

Workplace accidents with people who are sleep deprived or people who work shifts and they don't get the right amount of sleep during the day or at night.

So there's a few different ways that we treat insomnia. The first thing that we always do is we look at the cause.

We try not using medications initially, and we use something called behavioral therapy for insomnia. This changes behaviors people do in bed, none of the tossing and turning.

So when it comes to circadian rhythms, it's a clock that's basically programmed in our body. So if you think back to times when people lived on farms and we didn't have electricity.

We haven't really - it's harder for us to set those rhythms. So it's really important to keep a steady bedtime and wake time to really lock in those rhythms.

Now circadian rhythms become very interesting and problematic for patients because when you become a teenager, your rhythms actually tend to naturally shift.

So the deeper stages of sleep are really those times of quiescence, you're really restoring your body and we have a few different stages of sleep.

So people only focus on getting the really deep sleep, but in reality, we spend almost 60% of the night in the stage two sleep.

Really if it's an hour or two after you've fallen asleep because you're in such a deep sleep at that point.

Be true to yourself. Make each day a masterpiece. Help others. Drink deeply from good books. Make friendship a fine art. Build a shelter against a rainy day.

Ever consider what pets must think of us? I mean, here we come back from a grocery store with the most amazing haul - chicken, pork, half a cow. They must think we're the greatest hunters on earth!

I like to watch soccer, no matter what teams or players are in the field.

The pleasure which we most rarely experience gives us greatest delight.

The lot assigned to every man is suited to him, and suits him to itself.

Growing old beats the alternative - dying young.

I have never been sorry when I stood for what was right-even against severe criticism.

I'm always amazed by writers who say, "Oh you know I had a half hour so I sat down and wrote a little bit." I just need a real big chunk of time to sit down and focus. That's my process.

Unless we believe in the hero, what is there To believe? Incisive what, the fellow Of what good. Devise. Make him of mud.

Fear of ideas makes us impotent and ineffective.