Sleep stages and circadian rhythms Processing the Environment MCAT Khan Academy
Voiceover: Even thoughyou're not conscious during sleep, your brain is deceptively active. It goes through multiple cycles with distinct brain patterns, and it's very important to your ability to perform normal functionswhen you're awake. You have four main stages of sleep
which occur in approximately90 minute cycles during a normal night of sleep. The first three stages are all considered nonrapid eye movement, or nonREM which I'm going to abbreviate as N1, N2, and N3. N1 is the stage betweensleep and wakefulness. This is when your brainstarts producing theta waves.
You might experience strange sensations known as hypnagogic hallucinations, just kind of a fun name. These can include hearing or seeing things that aren't there such as seeing a flash of light, or a lot of people hearsomeone calling their name, or a phone ring, or a doorbell,
or something like that. Or if you've been doing something really repetitive just before bed, then that can recur inyour hypnagogic state. For example, if you'vebeen on a boat all day, you may still feel like you're on water when you drift off to sleep even if you're on dry land.
Or something that's actually called the Tretis effect, if you've been playing Tetris for a long time right before bed, then you might experience visual images of blocks or something all moving in the same direction kind of like the blocks in the game.
Another common feeling during this stage is a feeling of falling. That leads to what's called hypnic jerks, or those muscle twitchesyou sometimes experience as you fall asleep. So that's N1, our first,lightest stage of sleep. Then we move into N2 which is a slightly deeper stage of sleep.
Insomnia The Different Kinds A Few Solutions
Questioner: Could you please say something about insomniaé I've been suffering insomnia for nearly six years. So, could you give me some feasible instructionsé Sadhguru: Insomnia may be occurring for various reasons. There are some people who are sleeping well but they don't know that they are sleeping well (Laughs). There are some people who are not able to sleep well because maybe their body needs a certain amount of rest
and they believe it needs more, so they are just working themselves up. I've met so many people who are quite okay, but they think they are not sleeping enough because 's prescription of eight hours, they are not sleeping, they are sleeping only four hours. They are well, it's okay. If you're well, you are not sleep deprived and you're sleeping threefour hours a day, it's perfectly fine,
that's a good condition to be in. Or there are people who are unable to sleep because of their psychological situations. There are certain people who are not able to sleep because of their cellular or genetic situation. Only if you are like that, it's aâ€¦ it's a hard thing to fix, which you are not, okayé (Sadhguru Laughs) You are not genetically in that state.
Or in a cellular way, your body cells will not allow you to sleep for some reason, there are many reasons as to why. So, if you're not able to sleep, I think you should join our garden department (Laughter). Entire day, ten hours a day you work outside (Gestures), you'll fall asleep (Laughs), very.
If that doesn't work, the simpler way is, if you get initiated into Shoonya meditation The Shambhavi should do it. For most people, Shambhavi does this. If it did not work for you, if you're initiated into Shoonya mediation, you will see it'll correct theâ€¦ the sleep disorder,
if there is a sleep disorder. You're looking quite fine and happy. And if you are happy not sleeping, it's great (Laughter). Yes, because sleep is death. Every day, people are dying for six hours or eight hours or four hours. What's your choiceé Less death or more death per dayé Participants: Less.