How does your body just wake itself up?!

Question: How does your body just wake itself up.?
like, how do you wake u without an alarmclock, or someone waking you up.?.?.?
like on a saturday morning your eyes just pop open.?.?

lol, me and my friend are curious.?
haha.. and no criticism please. we just wanna know
:)Health Question & Answer

Rather than repeat what has already been written I will reference the previous Yahoo! answer and add a bit of my own findings:

Why does the human body wake up.?
Answered By David C:

inside your head you have three parts to your brain, and the brain runs at four speeds. slow for rest, medium for data storage, fast for awake states, and super fast in emergencies.

the oldest part is at the base of the skull ( 5%) near the spinal cord, it is reptilian in design, a throw back to our evoloution, and was designed to work on a cold blooded animal. this keeps the body functions working, and works on a 28 hour clock, which is reset with sunlight, from a time when our evolountary ancestors used the sun to warm up.

The mamial core, which overrides this brain (15%), is our short term memory, and works on a 28 day cycle, in tune with the luna cycles. it operates the maintenance system of our body, rplacing the fluids and cells in our body, and also stores the vital data we need for emergency reactions. all data is held in it, whilst it awaits sorting into the last part the nono-cortex, the grey matter, which makes up the 80% of the brain. but this part controls body temprature, and puts us into sleep mode, controls sleep and dreams, and wakes us up again

THE NANO-CORTEX works on a weekly routeen, and provides us with the sociual stimulus to make us wait for certain days of the week, it is also the main storage and data processing centre.

during sleep the brain takes about 3 hours to deep sleep, where it does the maintenence at slow speed, then 3 hours to do the REM (rapid eye movement) sleep where the memory is relived at medium speed (dreams) and indexed, stored or even backed up into long term memory. it takes about 40 minutes to slip into sleep with some silly dreams of our day, which we may remember, and about 30 minuted to switch from deep to REM sleep. finally we are slowly brought out of sleep with light dreams again, if jolted awake, we may remember a dream, or just be groggy, as the brain is not workiung at the right frequency to activly think for a few seconds.

Now for other data I have collected:

The NINDS has the most concise data:

Nerve-signaling chemicals called neurotransmitters control whether we are asleep or awake by acting on different groups of nerve cells, or neurons, in the brain. Neurons in the brainstem, which connects the brain with the spinal cord, produce neurotransmitters such as serotonin and norepinephrine that keep some parts of the brain active while we are awake. Other neurons at the base of the brain begin signaling when we fall asleep. These neurons appear to "switch off" the signals that keep us awake. Research also suggests that a chemical called adenosine builds up in our blood while we are awake and causes drowsiness. This chemical gradually breaks down while we sleep.

From Websciences:

There are some hypotheses regarding the role of sleep: memory consolidation, ecological factors, cellular repair and nervous system development. The sleep-wake cycle is an active process, modulated by subcortical regions (mesopontine nuclei, diencephalon and basal forebrain) with connections and reciprocal interactions among them. NO is released by neurons and terminals of the sleep-wake cycle modulatory nuclei. The role of NO in this cycle is mainly linked to activation processes: transition to and maintenance of waking and rapid eye movement (REM) sleep. At thalamic level NO is released by cholinergic fibers of the mesopontine nuclei and induces a facilitation of neural responses. In the basal forebrain there exists NO in the cholinergic cells contacting the cortex, suggesting that this ascending pathway can also collaborate in cortical activation through the release of NO. NO has been identified in neurons of the brain areas controlling the modulation of arousal; hence, this gaseous neuromodulator can have an essential function promoting a quick and global activation of cortical neurons.Health Question & Answer

If you wake up at a certain time each day then you're body will get used to this and will wake it self up natural because it's gotten into a routine. Health Question & Answer

i ave no clue i also wanna kno
it mite b depending on wat time u go to bed and compare that onto how much hrs u normally sleeep and do the calculationHealth Question & Answer

it depends how tired I am, but most of the time i automatically wake up at 4amHealth Question & Answer

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