sleeeeeeep[1] - Sleep and Dreams Sleep is controlled by...

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Sleep and Dreams Sleep is controlled by both subcortical structures and the cortex, itself. These structures are largely responsible for pulling the animal out of sleep or increasing the degree of alertness for animals that are already awake. The relationship between the cortex and alertness can be seen when a selective set of complex stimuli, whose recognition requires cortical involvement – e.g., a baby's cry, the smell of something burning, the sound of our own name – and are more likely to wake us than others, regardless of their "intensity". Sleep-wake cycle = Circadian rhythm (approximately 24 hours) Continuum of brain/body arousal. Eye senses light or dark, sends message (light vs. dark) to hypothalamus and pineal gland, which, if sleep is needed – i.e., b/c it's dark, release a sleep-inducing neurotransmitter: Melatonin . Measuring brain arousal during the cycle: EEG captures changes in voltage (neuron activity) in brain. From this, we have ascertained that there are 6 stages within the wake- sleep cycle. 6 phases of wake-sleep cycle (sleep cycle resets approximately every 90 minutes):
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sleeeeeeep[1] - Sleep and Dreams Sleep is controlled by...

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