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Sarah
@sarah485
Stage One Sleep
When we fall asleep, the nearly 86 billion neurons in our brain starts to fire evenly and rhythmically. Our sensory receptors become muffled at the same time.
The first stage of shallow sleep lasts for about 5 minutes.
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Orla Braun
@orlab44
Why Do We Dream? The Role of Dreams and Nightmares
Dreams as therapists
Your dreams may be ways of confronting emotional dramas...
Fight-or-flight training
One of the areas of the brain that’s most active during dreaming is the amygdala - the part of the brain associated with the survival instinct and the fight-or-flight response.
One theory suggests dreams may be the brain’s way of getting you ready to deal with a threat. Fortunately, the brainstem sends out nerve signals during REM sleep that relax your muscles. That way you don’t try to run or punch in your sleep.
Dreams as your muse
One theory for why we dream is that it helps facilitate our creative tendencies.
Without the logic filter, you might normally use in your waking life that can restrict your creative flow, your thoughts and ideas have no restrictions when you’re sleeping.
Rachel P.
@racfp15
How does your brain wake up from sleep?
How Scientists Study Brain Activity
- Scientists study activity in the brain with a tool called electroencephalography ( EEG), that measures electrical signals coming from neurons.
- The brain is not turned off while you...
How Our Brains Wake Us Up
- One of the systems in the brain that wakes us up is the reticular activating system (RAS) - a part of your brain located just above your spinal column that acts like a gatekeeper or filter for your brain, making sure it doesn’t have to deal with more information than it can handle.
- The RAS can sense important information and create neurochemicals that wake up other parts of the brain. It also keeps you awake throughout the day.
- Once the RAS switch turns on, it can take some time for your whole brain and body to wake up. This is because it takes a few minutes to clear all the “sleepy” neurochemicals from your brain, which is why you may feel groggy when an alarm clock wakes you up.
Why We Feel More Groggy On Some Days
When your brain is asleep, it shifts between deep and light stages. If your alarm clock goes off during a deeper stage of sleep, it takes longer for all the parts of your brain to wake up.
Juliana L.
@juliana_ell37
Sleep: how much do we really need?
Slow-wave sleep (deep sleep) – SWS
About 80% of our sleeping is of the SWS variety, identified by slow brain waves, relaxed muscles and deep breathing.
Deep sleep is important for the consolidation of memories. New experience...
Rapid eye movement (dreaming) - REM
Dreaming accounts for 20% of our sleeping time.
The length of dreams can vary from a few seconds to almost an hour. During REM sleep, the brain is highly active. The muscles are paralyzed, and the heart rate increases. Breathing can become erratic.
Sleep quantity
Although eight hours is the common mention, optimum sleep can vary from person to person and from age to age.
One review that worked through 320 research articles concluded 7 - 9 hours of sleep are enough for adults. According to experts, too little or too much sleep can both have a negative impact on your health.
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