I mean like shutting your eyes for a bit and maybe falling half asleep
In: Biology
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Another way to explain this would be: for the deep rest, you have to slow down your body. There are certain things your brain and your body do that require your body to function very very slow on minimum battery. Slow heartbeats, different temperature, slow breathing, those sorts of things.
Because is a type of rebooting.
Is like your brain is locking himself inside a room and organizing all the information it has of the day, putting inside the closet and clearing up space so you’ll have more space to add more info. Imagine if someone entered your room and filled it up with random things everyday and in the end of the day you had to organize and clean it. Throw some things in the garbage, keep others, put a few things over other things. Whatever made it more functional for your room to be usable.
At the same time, the body is also doing things like profoundly relaxing the muscles, which require a specific kind of hormone. It is a type of natural drug you release every night. Like a painkiller but from your brain. It makes your body get back to the “resting” state. Which means not tense, moving, actively doing something. (Except some essential parts of the body like the heart and lungs, those cannot stop of course, so they just slow down).
This process happens on a deep sleep.
On a light sleep you may or may not start this process. You may only rest partially, but not necessarily enter this “slow mode” state. And what causes the sense of being more tired is that you have to access more energy and faster to get out of this state. And that can feel painful to the body, because it isn’t natural.
Like you are carrying something heavy when you’re feeling weak. You have to get strong again before you can carry heavy stuff.
There are many causes for that to happen. It could be stress, could be that you have an appointment or that someone have wakened you. Or sometimes it could mean you had so many infos for the brain to organize even sleeping a lot of time it still was not enough for your brain to find enough space for you to go back to the next day. (Some people need more time alone, sometimes in the dark and silence to actually rest from some events).
Ultimately, only resting a little will only cause you to be more and more tired when you have a deep sleep. BUT there is an exception. (Next comment)
So rest comes in stages (simplified) and each stage lets your body process and repair things it needs to get back to working order. The deeper sleep does important things that make you groggy if interrupted, but the first stage isn’t as intensive.
So its like doing the stretches for a workout, and not feeling exhausted yet, but being ready for more! (where deeper sleep would be like doing the workout, but being interrupted before you got a chance to “rest, recover, hydrate, etc” so the workout is detrimental for now: you’re ‘groggy’ )
P.S> Search the history of this subreddit, pretty sure this has been asked multiple times now (try “power nap” e.g.)
Some specific people only enter the deep sleep state when they are exhausted. And they only feel “safe” and comfortable to enter that state at those types of naps. (Because of a brain tricking kinda thing where they believe they are not sleeping, therefore the issue they have with sleeping does not exist because it’s just a nap)
But once they go to sleep, with the intent of sleeping, they don’t actually enter the deep state of sleeping. They have the superficial kind of sleep. Those people will feel the difference very significantly, not only for the feeling of being slow, but for the actual difference of how deep their sleep was.
In that case, it’s a mind matter of stressing about your sleep and it will depend on the person the reason why they believe it’s not okay to rest.
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