Your central circadian clock, located in your brain, tells you when it is time for sleep. Other circadian clocks are in organs throughout your body. Your body's internal clocks are in sync with certain cues in the environment. Light, darkness, and other cues help determine when you feel awake and when you feel drowsy.
Circadian rhythms are physical, mental, and behavioral changes that follow a 24-hour cycle.
But if you wake suddenly, the muscles sometimes twitch. This is a 'myoclonic jerk' – an involuntary twitch that occurs in some neural diseases, but more often in healthy people when falling asleep. Some people are woken frequently by myoclonic jerks.
A typical circadian rhythm in humans is one where peak alertness is around 2-3 hours after awakening and 9-10 hours after awakening, and where fatigue is most likely at around 3 AM, if you wake up like most people do at around 7-9 AM in the morning.
“There is no such thing as a “fixed or ideal time” to go to bed which will suit all individuals. It is generally advisable to fall asleep between 10 pm to midnight as for most people this is when the circadian rhythm is at a point that favours falling asleep.”
When it comes to bedtime, he says there's a window of several hours—roughly between 8 PM and 12 AM—during which your brain and body have the opportunity to get all the non-REM and REM shuteye they need to function optimally.
In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (1–4 Hz), high-amplitude fluctuations called delta waves, the characteristic slow waves for which this phase of sleep is named. The entire sequence from drowsiness to deep stage IV sleep usually takes about an hour.
Waking up at 3 am is not considered good as it is also known as the Devil's hour. It is believed that at this time strange things happen which includes free passage of two dimensions. This is believed to be the time when the line between the living and the dead thins down.
You could be experiencing a symptom of depression known as diurnal variation of mood, commonly referred to as morning depression. People experiencing diurnal mood variation feel worse in the morning but gradually improve as the day goes on. Hence the name morning depression.
It's normal for the muscles to relax, of course, but the brain gets confused. For a minute, it thinks you're falling. In response, the brain causes your muscles to tense as a way to "catch yourself" before falling down — and that makes your body jerk.
If you aren't feeling rested when you wake up, despite getting to sleep at least 8 hours prior, then it might not be the quantity of your sleep that's the problem. It could be your sleep quality that needs some attention. The amount of sleep you get is important, but equally important is the quality of that sleep.
"As soon as you wake up after a night of sleep, you should get out of bed. If you lie awake in bed, your brain links being awake to being in bed," according to Professor Matthew Walker from University of California Berkeley.
Let's take a look at the liver. According to the Organ Clock it is the most busy during 1-3am at night. (Assuming you go to bed around 10-11pm.) If things are running smooth in the liver, you will never notice that it is working at all.
Two internal biological mechanisms–circadian rhythm and homeostasis–work together to regulate when you are awake and sleep. Circadian rhythms direct a wide variety of functions from daily fluctuations in wakefulness to body temperature, metabolism, and the release of hormones.
Sleeping a lot isn't necessarily a bad thing. Sleep is important. Not getting enough sleep puts you at risk for health problems, from heart disease to obesity to diabetes. However, sleeping a lot all of a sudden when you didn't before might be a reason to look closely at what is going on with your health.
According to sleep specialists, most people actually wake up about 6 times per night, and one of those is usually around 2 or 3 am, depending on when they hit the hay. They also say that waking up at that time is just a sign that we have shifted from deep sleep to a lighter sleep where our brains are more active.
What should you do when you wake up in the middle of the night? The next time you wake up at 3 a.m. (or whatever time), give yourself 15 to 20 minutes to doze back into dreamland. It's OK. If you're awake longer than that, it's best to get out of bed, advises Dr.
According to my survey, most people (22%) wake up between 6:00 AM - 7:00 AM. If you wake up past 10:00 AM, I recommend going to bed and waking up earlier, as it's going to help with productivity levels throughout the day. And if you're lucky, you'll miss the morning traffic.
The length of a dream can vary; they may last for a few seconds, or approximately 20–30 minutes. People are more likely to remember the dream if they are awakened during the REM phase.
Dreaming sleep is a deep stage of sleep with intense brain activity in the forebrain and midbrain. It is characterized by the ability of dreams to occur, along with the absence of motor function with the exception of the eye muscles and the diaphragm.
REM sleep happens about an hour to an hour and a half after falling asleep. REM sleep is when you tend to have vivid dreams.
Research suggests that sleeping naked may potentially positively impact reproductive health, connection with a partner, and self-esteem. Currently, there isn't much scientific research studying the effects of sleeping nude, or reliable data on what percentage of people in the U.S. sleep naked.
Between the times of 10:00 pm and 2:00 am the body goes through a dramatic process of physical repair. Between roughly 2:00 am and 6:00 am the body will go through a process of psychological repair. A disrupted sleep pattern will cause the Cortisol to elevate and negatively affect the regenerative process.