Any process in which an organism enters and maintains a periodic, readily reversible state of reduced awareness and metabolic activity. usually accompanied by physical relaxation, the onset of sleep in humans and other mammals is marked by a change i
"Sleep is the greatest legal performance enhancing drug that most people are probably neglecting."
Humans beings are the only species that deprive themselves of sleep for no apparent gain. Mother nature has never faced the challenge of coming up with a safety net for lack of sleep.
All stages of sleep are important - "mother nature wouldn't waste time putting you into a state that wasn't necessary.
Our cardiovascular system goes through periods of dramatic acceleration and then dramatic deceleration. Our brain paralyzes our body so our mind can dream safely, so we don't dream that we can fly and then attempt to do this.
Our brain replays memory sequences we learn while awake, but approximately twenty times faster than when you're awake.
Canabis is very good at blocking REM cycles . Marijuana certainly puts people to sleep quicker, but it's debatable whether it's naturalistic sleep.
Alcohol is also very good at blocking REM cycles. When an alcohol stops drinking alcohol, they'll often develop delirium tremens. The alcohol has been blocking REM sleep for so long, and the pressure for deep sleep has built up so much, it spilled over into wakefulness.
When we dream, we essentially become psychotic – we see things that aren’t there (hallucination), we believe things that couldn’t possibly be true (delusion), we have wildly fluctuating emotions, and we become confused about time/place .
In the brain, during REM sleep, the chemistry of the brain is very different . This specific balance of noradrenaline and acetylcholine change the input/output of information flow into the memory center of the brain
It’s more about output (generating dreams), than input (the saving of memories/dreams) .
This is very similar to a DMT trip – shortly afterwards it feels like a dream
Perhaps it’s just a byproduct of REM sleep - Dr. Matthew Walker doesn’t agree with this because it’s metabolically demanding to have dreams in addition to REM sleep, and whenever mother nature burn calories it’s usually for a reason
Lack of sleep and physical performance
If you're getting 6 hours or less of sleep, your time to physical exhaustion drops by up to 30%.
We need 7-9 hours each night. Impairments in the brain below 7 hours each night are measurable.
Why We Sleep: Unlocking the Power of Sleep and Dreams
Matthew Walker, PhD