Well, honey, when someone is in deep sleep, they're out like a light. You can tell by their breathing becoming slow and steady, their muscles relaxed, and their brain waves slowing down. Basically, they're in dreamland and you better not wake them unless you want to deal with a grumpy bear.
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During deep sleep, also known as slow-wave sleep, the body experiences slow brain waves, relaxed muscles, and decreased heart rate and breathing. To determine if someone is in deep sleep, you can monitor their brain activity using an electroencephalogram (EEG) to detect the presence of slow-wave sleep patterns. Additionally, you can observe their physical characteristics such as minimal movement, reduced responsiveness to external stimuli, and overall deep relaxation.
The obvious thing you will see is usually the sleeping person walking. Note that the person's eyes are open when they sleepwalk. They may do strange things, like mutter inaudible words or even cook a meal. The best thing you can do is just gently tell them to go back to bed, and they will do so.
Well. Their pupils are smaller than the regular size. So open the persons eyes with your finger and see if their pupils are small. If you don't know the difference between small and normal pupils just look into a persons eyes and you will know what they look like when they're normal (make sure the persons eyes your looking in is awake!) Then look into eyes of a person sleeping then compare them. And THAT'S how you know if someone is sleeping! :D
They could be...........
-Snoring
-staying in place not moveing around and fliping everywhere.
-some people talk in there sleep. (so they wont be talking LOL)
-they wont be moveing there fingers BUT they r still breathing LOL
When someone is in REM sleep, the only type of sleep to have dreams, the eyes will be closed but can be seen darting around under their eyelids.
talking
wiggling
eyes moving
smiling
twitching
there breathing should be relaxed. If you try to speak to them, they should not respond. there eyes should not be clinched shut, but relaxed.
Look for random muscle spasms in their hands or legs in the beginning sleep stages and heavy breathing in the latter.
When the heart beat slows down to a calm state, and their breathing is slow and rhythmic.