Sleep is the most important part of our life-cycle. According to nature human should set aside approx. 1/3 part of the day(24hour) for the sleep.
SLEEP CYCLE- It is divided into four stages 1-Non-Rem stage N1-falling asleep 2-Non-Rem stage N2-Light sleep 3-Non-Rem stage N3-SW slow wave or deep-sleep . 4-REM (Rapid Eye Movement stage)-stage R. .Stage1-N1-it is a stage of yawning.It lasts for 5-150Mnts., when we start falling asleep. We take 2,3 or multiple yawn and then fall asleep. Heart beat and breathing slows down Muscles begin to relax. But this phase of the sleep is very slight. One can awake easily at any disturbance . Sage2-N-2– In this stage eye movement becomes still,body temp.,drops.Brain produces Sleep-spindle.It lasts for about 25 Mints. Stage N3-It is the most vital and deepest sleep state. Eyes are motionless. Heart-rate and breathing are at its slowest pace. Brain produces Delta waves-most calming stage. Growth, repair, tissue regeneration are initiated. Immunity is boosted-up at this stage. Stage 4-,(R) REM-Rapid Eye Movement- It is the stage of Dreaming, Eyes move rapidly.There is increase in Heart abd breathing rates. Brain activity is markedly increased. Important phenomenon is Paralysis of limbs. Otherwise person may enact or walk.If this limb paralysis becomes ineffective. Night-Walking ir enacting some bizarre act may occur. Owls and Larks Sleepers
BRAIN WAVES IN SLEEPING STAGES -In awakened stage low voltage , high freqquency Beta waves are active. At Drwosy stage Alpha waves are active.It is the most suggestive stage of the brain .Brain accept everything without any filter.Then comes the stage 1 sleep ,when Theta wave become active . Stage of sleep spindles is the secons stage Here there mixed EEG activities are detected It is followed by SW or slow-wave sleep ,stage 3-4 . It is the most important part ,Delta waves are predominant with tissue repair ,healing and immunity are boosted up at this stage. Afer this comes the REM- rapid eye movement stage ,characterised by low voltage and high frequency waves.
Best Time to Sleep-Age old saying is “Early to bed and early to rise makes a man healthy wealthy and Wise.” But there are two types of sleepers in this world ,Owls and Larks. Owls and Larks-Early risers are known as Larks, who are more active in the morning. While those who sleep later in the night and remain active past-midnight are called Owls. It is because of the different Circadian Rhythm amongst them. This regulates their body temperature and makes active and passive at different times.
Why Sleep is so vital for Us? – 1-It stores and organizes memory. Our Day-to-day or short term memory is converted into long term. This occurs in the Rem cycle of the sleep ,while brain is most active.But attention, learning are least active. 2 Repairing of body tissue-During sleep ,division of various cells of the body are at its maximum. Thus it causes repairing of tissues, which are damaged during wear and tear. 3-Toxins and wastes are cleared from the Brain-Waste product of metabolism during the day and toxins accumulated are cleared during sleep. 4-Rest to the Brain-Brain become minimally inactive or at its slowest during non-rem sleep. So it is sort of recharged and you feel refreshed when awake after good sleep. 5-Clearing out and replenishing vital brain chemicals. -Some of the brain chemicals, which are accumulated during the day are associated with plaque formation in the brain. It us cleared during sleep. If it is not cleared, will lead to degeneration of brain and Alzheimer disease .Dementia may also issue. So you can very well realize how important is sleep.
Sleep should be never be neglected ,because it causes repair of the awake-time wear and tear tissues,clears the brain toxin and boosts immunity, staves us from Alzeimer-disease and provides a refreashing day and quality time. Satish Tripathi sctri48