Dr. Terry Sejnowski

And the only thing that I know that might explain a little bit is that the dreams are often very visual, rapid eye movement sleep, so that there's something happening. Actually, it's interesting. All the neuromodulators are downregulated during sleep. And then during REM sleep, the acetylcholine comes up, right? So that's a very powerful neuromodulator. It's important for attention, for example.

And the only thing that I know that might explain a little bit is that the dreams are often very visual, rapid eye movement sleep, so that there's something happening. Actually, it's interesting. All the neuromodulators are downregulated during sleep. And then during REM sleep, the acetylcholine comes up, right? So that's a very powerful neuromodulator. It's important for attention, for example.

And the only thing that I know that might explain a little bit is that the dreams are often very visual, rapid eye movement sleep, so that there's something happening. Actually, it's interesting. All the neuromodulators are downregulated during sleep. And then during REM sleep, the acetylcholine comes up, right? So that's a very powerful neuromodulator. It's important for attention, for example.

But it doesn't come up in the prefrontal cortex. which means that the circuits in the prefrontal cortex that are interpreting the sensory input coming in, are not turned on. So any of these, whatever happens in your visual cortex is not being monitored anymore.

But it doesn't come up in the prefrontal cortex. which means that the circuits in the prefrontal cortex that are interpreting the sensory input coming in, are not turned on. So any of these, whatever happens in your visual cortex is not being monitored anymore.

But it doesn't come up in the prefrontal cortex. which means that the circuits in the prefrontal cortex that are interpreting the sensory input coming in, are not turned on. So any of these, whatever happens in your visual cortex is not being monitored anymore.

So you get bizarre things, you know, that you start floating and, you know, things happen to you and, you know, it's not anchored anymore. And so, but that still doesn't explain why, right? Why you have that period. It's important because if you block it and there are some sleeping pills that do block it, you know, it really does cause problems with, you know, normal cognitive function.

So you get bizarre things, you know, that you start floating and, you know, things happen to you and, you know, it's not anchored anymore. And so, but that still doesn't explain why, right? Why you have that period. It's important because if you block it and there are some sleeping pills that do block it, you know, it really does cause problems with, you know, normal cognitive function.

So you get bizarre things, you know, that you start floating and, you know, things happen to you and, you know, it's not anchored anymore. And so, but that still doesn't explain why, right? Why you have that period. It's important because if you block it and there are some sleeping pills that do block it, you know, it really does cause problems with, you know, normal cognitive function.

No, no. It's an imbalance that was caused because the brain adjusted to the endocannabinoid levels. And now it's got to go back and it takes time. But it's interesting. It's interesting. It affects dreams. I think that may be a clue.

No, no. It's an imbalance that was caused because the brain adjusted to the endocannabinoid levels. And now it's got to go back and it takes time. But it's interesting. It's interesting. It affects dreams. I think that may be a clue.

No, no. It's an imbalance that was caused because the brain adjusted to the endocannabinoid levels. And now it's got to go back and it takes time. But it's interesting. It's interesting. It affects dreams. I think that may be a clue.

You know, that's an interesting hypothesis. How would you test it?

You know, that's an interesting hypothesis. How would you test it?

You know, that's an interesting hypothesis. How would you test it?

That's right.

That's right.

That's right.

It's true. Yeah, it's true. By the way, there are two kinds of dreams. Very interesting. So if you wake someone up during REM sleep, you get very vivid dreams. Changing. Dreams, they're always different and changing. But if you wake someone up during slow-wave sleep, you often get a dream report, but it's a kind of dream that keeps repeating over and over again every night.

It's true. Yeah, it's true. By the way, there are two kinds of dreams. Very interesting. So if you wake someone up during REM sleep, you get very vivid dreams. Changing. Dreams, they're always different and changing. But if you wake someone up during slow-wave sleep, you often get a dream report, but it's a kind of dream that keeps repeating over and over again every night.