For many people,
sleep is a burden which they would love to do away with.
I mean imagine how much more you could do
in a day with 2 extra hours.
But what would actually happen
if you cut out 2 hours of your sleep every night.
First, we need to understand how much sleep
your body and brain actually need.
The vast majority of research on the topic has concluded that
around 8 hours of sleep is optimal for the average person.
But today almost 50% of people get 6 hours or less each night.
Now the first night of less sleep
may actually triger the mesolimbic system:
releasing dopamine, and giving you a sense of adrenaline.
But your brain slowly begins to shut off
the areas associated with planning and making decisions.
And even though you may still feel fine getting 6 hours,
the truth is actually much darker and worrisome
than you might realize.
Scientists use a technique known as psychomotor vigilance tasks
or PVTs to understand the impact of
sleep deprivation on human in studies.
Simply put, it’s a reaction test:
a red button randomly turns green
and people have to push it as fast as possible.
Not so surprisingly, those who get 8 hours of sleep over a 2-week period
show very few lapses in attention and no cognitive declines.
But those groups that receive either 6 or 4 hours of sleep
see declining PVT results on almost a daily basis
for the entire 2-week period.
Of course the 4-hour group performs the worst.
But these results don’t just show a loss of concentration,
they show full lapses and awareness called “ microsleeps ”.
In other words,
their brains aren’t just slower but shutting off for moments at a time.
When looking at the results deeper, scientists concluded that
getting 6 hours of sleep for 10 days in a row
was the same as not sleeping for 24 hours straight.
That’s the same cognitive decline as being legally drunk.
And if you get 4 hours of sleep for 11 days,
it’s like you haven’t slept for 48 hours straight.
These studies also show that
participants were not at all aware of their cognitive declines.
In other words, when you are tired,
it’s like being that drunk person at a party
who insist that they can drive home fine.
Other tests show that your ability to memorize, maintain information
还有研究表明 记忆力 维护信息的能力
or even do simple maths or problem solving decline at similar rates.
But perhaps the scarest fact is that
even after one night of 4 or 5 hours of sleep
your natural killer cells which stop cancer cells
from poliferating in your body drop by 70%.
You are also more likely to catch a cold
because your immune system is weakened
which is why when we’re sick,
we feel compelled to sleep so much.
Chronic lack of sleep is also linked to bowel, prostate and breast cancer,
长期缺乏睡眠会增加肠癌 前列腺癌 乳腺癌的风险
and people over 45 who sleep under 6 hours a night
are also 200% more likely to have a heart attack or a stroke.
Even the World Health Organization has classified
any form of nighttime shift work is a probable caricinogen.
So even though you may swear that cutting 2 hours
of sleep makes you so much more productive
and that you don’t feel any worse.
Just remember that every single day
your cognitive abilities continue to decrease,
costing you much more than you may have bargained for.
Be sure to check our latest video
where we challenged ourselves to wear
every single piece of plastic we used for 7 days
while living in our normal life,
in public, which was insanely embarrassing.
We really want to make more content that
can affect people’s lives in the planet.
And this one has a ton of cool science in it
but was’t seen by that many people,
so we really appreciate it you checking it out.
And if you want to learn more about sleep and pushing yourself,
our latest podcast is about hustle culture
and touches on every ideas of studies
related to stress, sleep
and how much you should be working to optimize your results.
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and we will see you next time for another video.
For many people,