How does our brain actually get rest?

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I know sleep is the correct general answer. I understand our bodies get tired. But exactly HOW does this work? Even when you are sleeping your brain is still working, and studies suggest it’s actually more active, so how does sleeping rest you if your brain is still active?
Also: isn’t it interesting that every creature needs sleep?

In: 99

You get tired because of a buildup of adenosine in your brain throughout the day – caffeine blocks adenosine from binding those receptors and prevents you from feeling tired when you consume it. Your brain is performing house keeping functions and consolidating memories while you sleep.

IIRC, the brain essentially turns off different areas that are needed for awake time and activates areas that are needed for sleep time. Also, interestingly enough, it also freezes most of your motor functions, so your appendages also get rest from work. That’s why if you jolt awake, its from a disruption in that center, or people who sleepwalk have issues there.

Neuroscience student here. The mentioned answers about adenosine and altered brain activity are true.

To expand further: toxic metabolite buildup happens all the time during waking hours. During sleep, our brain retracts many dendritic/synaptic connections and washes cerebrospinal fluid through the tissues which reduces beta-amyloid and other protein (think Alzheimer’s) buildup.

Essentially sleep is a period of rejuvenation, detox, and encoding; very essential for all creatures with a „brain.“

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I know sleep is the correct general answer. I understand our bodies get tired. But exactly HOW does this work? Even when you are sleeping your brain is still working, and studies suggest it’s actually more active, so how does sleeping rest you if your brain is still active?
Also: isn’t it interesting that every creature needs sleep?

In: 99

You get tired because of a buildup of adenosine in your brain throughout the day – caffeine blocks adenosine from binding those receptors and prevents you from feeling tired when you consume it. Your brain is performing house keeping functions and consolidating memories while you sleep.

IIRC, the brain essentially turns off different areas that are needed for awake time and activates areas that are needed for sleep time. Also, interestingly enough, it also freezes most of your motor functions, so your appendages also get rest from work. That’s why if you jolt awake, its from a disruption in that center, or people who sleepwalk have issues there.

Neuroscience student here. The mentioned answers about adenosine and altered brain activity are true.

To expand further: toxic metabolite buildup happens all the time during waking hours. During sleep, our brain retracts many dendritic/synaptic connections and washes cerebrospinal fluid through the tissues which reduces beta-amyloid and other protein (think Alzheimer’s) buildup.

Essentially sleep is a period of rejuvenation, detox, and encoding; very essential for all creatures with a „brain.“