So we have this early wake time, this circadian surge in wake propensity and it's an unintended consequence of artificial light.

But our circadian rhythms, which are the rhythms that help us to wake and sleep and be alert and relaxed and so forth and so on, they are much more triggered by blue light.

And I first learned what a profound effect this was having when we made the discovery, a few years ago, that some blind people, who have no conscious light perception that their internal circadian clock can be shifted by light that they can't see.

And here, you can see that light exposure in the evening hours, resets our internal clock to a later hour, and light exposure in the morning is resetting your circadian system to an earlier hour, and that's how we keep in synch with the 24 hour day.

And that's because just in the same way that the ear has two functions one is for hearing and the other is for balance also the eye has two functions one is for seeing each other and the other is for circadian photoreception or resetting this internal clock.

And so what happens is every morning when the sun comes up the squid goes back to sleep, it buries itself in the sand, and it's got a pump that's attached to its circadian rhythm, and when the sun comes up it pumps out like 95 percent of the bacteria.

The artificial light to which we're ordinarily exposed has pushed the circadian system to a later hour and shifted us to the equivalent of Hawaiian time, shifted our brains westward, placed this second wind late in the evening and squeezed the timing available for our biological night, because we're still getting up with the chickens.