Why we sleep is said to be one of the greatest unsolved mysteries of science. Haven't they cracked it yet? is there any animal or even living system that doesn't sleep?
Why we sleep is said to be one of the greatest unsolved mysteries of science. Haven't they cracked it yet?
is there any animal or even living system that doesn't sleep?
Despite extensive research, we aren't entirely sure on all the functions of sleep nor on why sleep is necessary for these functions. The brain is an incredibly complex biological system, even in creatures as simple as insects. Add to that all the different ways the brain interacts with the body and the difficulty of probing things at the microscopic scale and you quickly run into enormous hurdles. Simply figuring out how a single cell works has taken decades and decades of research, and we still don't know all the details. How do you observe all the different chemical and physical changes going on in a cell without killing it? How do you observe the interactions of neurons with other neurons without being able to directly observe the propagation every electrical impulse and chemical change throughout the entire network of neurons? And then you have to take into account the fact that there are multiple neurotransmitters, hormones, inhibitory signals, excitation signals, and countless other things all happening at the same time. And you can't simply dissect a creature to figure these things out, as a dead brain does none of the above, so you have very little to observe.
Not sure. Try this article: https://en.wikipedia.org/wiki/Sleep_(non-human)
Are their living systems without any brains.. do they also sleep?
Have we fully mastered the cell.. or understood each of the function down to microdetails?
Maybe cells themselves need rest?
But then heart cells continue to beat without rest (is this true).. so can't we say sleep benefit each individual cell?
And no, I am not going to try to find the reference for this one. I am not even sure where to start. Someone else may know.
They argue that moving from the trees to the ground allowed our ancestors to sleep more deeply – "which could in turn have affected cognition", says Samson.
The most accessible or significant are the rats experiment in which they died within 2 weeks when they lack sleep. Has any others replicated this?
True. A good article on the topic and loaded with citations:
Yes, many people have died trying to go without sleep, a world record holder went 11 days without sleeping: https://en.wikipedia.org/wiki/Randy_Gardner_(record_holder)
You only have to look at our own world.Could sleeping occur because the earth has night and day cycle and somehow evolution integrate this into the system? Can this be refuted? In a planet with two suns where there is no night. Perhaps there is no need for sleep?
The midnight sun is a natural phenomenon that occurs in the summer months in places north of the Arctic Circle or south of the Antarctic Circle, when the sun remains visible at the local midnight. Around thesummer solstice (approximately 21 June in the Northern Hemisphereand 22 December in the Southern Hemisphere) the sun is visible for the full 24 hours, given fair weather. The number of days per year with potential midnight sun increases the farther towards either pole one goes. Although approximately defined by the polar circles, in practice the midnight sun can be seen as much as 55 miles (90 km) outside the polar circle, as described below, and the exact latitudes of the farthest reaches of midnight sun depend on topography and vary slightly year-to-year.
There are no permanent, economically autonomous human settlements south of the Antarctic Circle, only research stations, so the countries and territories whose populations experience the midnight sun are limited to those crossed by the Arctic Circle: Canada(Yukon, Northwest Territories, and Nunavut), Greenland, Iceland, Finland, Norway, Russia, Sweden, and the United States(Alaska). A quarter of Finland's territory lies north of the Arctic Circle, and at the country's northernmost point the sun does not set at all for 60 days during summer. In Svalbard, Norway, the northernmost inhabited region of Europe, there is no sunset from approximately 19 April to 23 August. The extreme sites are the poles, where the sun can be continuously visible for half the year.
Thanks.The Jellyfish has no nervous system and no brain yet it still sleeps.
Please provide a reference for: Thanks.
Sleeping seems to have more to do with memory consolidation and some brain housekeeping. So why is this not accepted as the final answer?
When I lack sleep. I get colds and upper respiraratory infection more easily. But isn't it that our immune cells travel in the body by Brownian motion.. so what do you think is the effect of lack of sleep on the immune system really? Does it mean the immune cells have to sleep too and they get weaker if they lack sleep?
Also I can't find knock out fruit fly or experiments where they are not made to sleep for days.. do they also die like the rats?
isn't it that our immune cells travel in the body by Brownian motion