Updated: May 18, 2022
Sleep is a process of a complex neurological phenomenon, which helps the body to rest and restore energy levels. Sleep is highly rhythmic and a sole neural process performed by various brain areas.
Sleep is highly needed for the body on a daily basis for many refreshing reasons and repair functions. Statistics have it that an average man sleeps for about one-third of their lifespan. This is nothing to fear or see as too much, our body needs it for optimal functioning.
Most times in many cultures, sleep times are split between daytime and night. Some cultures have naps in the form of a siesta during the day and the usual night rest after sunset.
Clinically, the normal human sleep is divided into two major classifications which are;
Rapid Eye Movement (REM) Sleep, and
Non–Rapid Eye Movement (NREM)
The rapid eye movements occur 4-5 times during normal night sleep. The process of waking up happens during alteration between one of the Rapid Eye Movement times and Non-Rapid Eye movements in the course of sleep.
The non-rapid eye movement sleep is further classified into four. This classification reveals the depth of sleep stages. They are stages I, II, III and IV.
Rapid and non-rapid eye movements take place alternatively during the sleep process. The first Rapid Eye Movement sleep may not be up to 10 minutes, while the last Rapid eye movement sleep could take up to one hour or more.
The total amount of sleep time needed by an adult human is usually constant. In adults, a night of fully restful and restorative sleep is between 7 to 8 hours.
Newly born, are seen to sleep longer for about 14 to 16 hours daily. This is known as a polycyclic sleep pattern. It is converted to the monocyclic sleep pattern of an adult as the child grows.
Today, we will be looking into what sleep is about, alongside the many disorders experienced by people and possible ways to combat them.
FACTS ABOUT SLEEP; HOW SLEEP HAPPENS
Sleep consists of a rhythmic (circadian) combination of changes in physiological, biochemical, and psychological processes.
How the brain controls sleep: The ascending reticular activating system of the brainstem keeps the cortex and rest of the brain tonically active during wakefulness.
Sleep is actively produced by the preoptic and other basal forebrain areas, says VM Kumar of the Department of Neurology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala State, India.
Homeostatic process: The homeostatic sleep drive is a process that is built up over wakeful time, the longer you are awake, the more the drive to sleep and it is reduced during sleep time. It is also referred to as the hourglass model of sleep.
The homeostatic sleep drive is built by a long wakeful time during a normal day.
The homeostatic sleep process is primarily influenced by the release and accumulation of some neuro substances known as adenosine.
The release and functioning of adenosine in the brain are strictly activity-dependent. Adenosine is formed through the intracellular breakdown of the popular energy-rich molecule, Adenosine-Tri-Phosphate (ATP).
The homeostatic process can also be inhibited or altered by catalysts which change the direction of the process. One of such is the consumption of caffeine-rich foods. Caffeine is a psychostimulant.
The consumption of coffee which contains caffeine opposes the actions of adenosine and in turn, changes the regular process and causes more wakefulness.
The Circadian rhythm: this is the endogenous clock that works in the fashion of a literal clock, ticking and notifying our organs about the different times of the day.
This circadian process is all-natural and works with the environmental day and night fashion.
Reasons why your body wants to fall asleep at night after sunset. The circadian rhythm is controlled by the anterior hypothalamus of the brain.
The interaction of these two processes results in 16 hours of consolidated wakefulness and 8 hours of sleep when functioning optimally.
Having understood what sleep entails and how it works, now let us take a look at sleep disorders and their possible effects as well as their solutions.
Benefits and functions of sleep
The benefits of sleep include a variety of body functions and enhancement of efficiency of a person during wake time.
In the review article published by Chokroverty in the Indian journal of medical research, Sleep is thought to be restorative, conservative, adaptive, thermoregulatory and memory consolidative functions. All these are bodily functions which support almost every aspect of life.
Risk effects of sleeplessness or sleep deprivation
The deprivation of sleep or sleeplessness is very harmful to the general health and wellbeing of any individual. Although, this could be caused by substance or drug use, medications, or even neurological diseases.
The deprivation of sleep could either lead to long term or short term consequences or problems.
When a person doesn’t get adequate sleep for a while, it could lead to reduced attention span, very significant low level of productivity, sleepiness during the day, frequent tiredness, simple unexpected accidents at work, home, roads etc.
The long term effects of sleep deprivation include but are not limited to organ malfunction, increased risk of various health problems like heart diseases, hypertension, diabetes, obesity, eye problem, nervous system problems, memory loss, constant fatigue, and increased death chances from road accident while driving. There is also a high risk of falling into depression.
Sleep disorders are conditions that prevent a person from getting restful sleep and, as a result, can cause daytime sleepiness and reduced efficiency.
According to the international classification of sleep disorders, there are more than a hundred sleep/wake disorders. Today, we will be looking at a number of them along with how they affect us.
The major sleep disorders, which happen to be the most common of all numerous ones are:
Restless legs syndrome
Circadian Rhythm disorder
Quite a majority of people complain about not getting enough sleep and it is seen to be the most prevalent sleep disorder. Insomnia is the inability to get sleep at the appropriate time desired and that is long enough to cause a person to be refreshed and rejuvenated for the new day.
Insomnia is also characterized by the inability to have long sleep at a time, or even difficulty in getting sleep after a wake in between sleep.
This also could lead to a series of unpleasant feelings like drowsiness during the day.
Insomnia is so terrible that it has been seen to be a risk factor for a number of psychological problems like substance abuse and depression.
In this case, insomnia has been seen to be a risk factor for