markers = amazon, amazon prime, amazon.com, amazon video, prime video, amazon customer service, kindle unlimited, kindle, amzon, owala, amazon shopping, amazon prime movies, mixer, shop deals, timer, amazon prime login, amazon usa, amazon prime day, amazon photos, free porno, ps5, playstation 5, iphone 15 pro max, am, iphone 11, amaozn, amazon customer service phone number, amazon chat, amazin, amazon fresh, saltburn, young sheldon season 7, amazon books, hillbilly elegy, prime day, a, amazon music, xbox series x, wordle game, amaon, whole foods, amazon gift card balance, squishmallow, amazon login, amazom, gadgets, www.amazon.com, office 365, new balance 9060, map of the united states, amazon marketplace, amazon kindle, spanish to english, amazone, despicable me 4, amazon credit card, phone number 866 216-1072 amazon customer service number, amazon orders, skechers, batana oil, reacher season 2, prime day 2024, iphone 14 pro max, amazon gift card, freevee, world map, sex toys, amaz, xbox series s, stanley cup, amazon customer service number, amazon prime video, owala water bottle, amazon movies, amz, shop holiday gift sets, fire country season 2, amazonprime, oppenheimer streaming, amazon phone number, amazon prime shopping, skibidi toilet, kindle paperwhite, amazon outlet, amazon returns, amazon smile, iphone 12, young sheldon, it ends with us, amazon.com/code, amazon customer service chat, iphone 13 pro max, dune 2, 1 888 280-4331 amazon customer service phone number, amozon, anazon, instant pot, hey dudes, prime now, shop backpacks on sale, amaxon, amazon baby registry, amazon fire stick, firestick, amazon prime now, kindle books, ross, amazon video prime, stopwatch, poor things, amazon music unlimited, baddiehub, voltaren gel, pimple patches, 48 laws of power, nmn supplement, drift boss, iphone 15 pro, godzilla minus one, amazon now, samsung galaxy s24 ultra, air fryer, influencersgonewild, alexa pearl, amazon echo, rockauto, synchrony bank, electric bike, amazon drive, amazon prime student, nespresso machine, amazon prime tv, amamzon, ice spice, squishmallows, monitor, the boys season 4, amazon account, contact amazon, airpods max, sleeping porn, keyboard, amazon black friday deals, airtag, adidas campus 00s, watch the hunger games: the ballad of songbirds & snakes, amazon .com, chastity cage, amazon store card, barron trump, sukuna, laptops, demon copperhead, amazon hub, ring light, airpod max, magnesium glycinate, scientific calculator, iphone 14 pro, amazo, wyze, all the light we cannot see, lululemon belt bag, canon g7x, color wheel, tongue scraper, lessons in chemistry, www.amazon.com/mytv, amazon live chat, amazon business account, gojo satoru, prime day deals, rose toy, stanley tumbler, sex swing, the body keeps the score, amazon my orders, qvc.com official site, my amazon orders, kindle store, megan is missing, how to cancel amazon prime, fire tv, weighted vest, amao, amazon., amazon,com, poppi soda, meta quest 3, blackhead removal, amazon return policy, amazon support, kung fu panda 4, amazon', computer desk, iphone 13 pro, 1 (888) 280-4331 amazon customer service español, oppenheimer, amazon.com/redeem, airpods pro 2, maxton hall, amazon fire tablet, heating pad, flipper zero, verity, amazon tv, airpod pros, a gentleman in moscow, ninja creami, prime music, trump 2024, sex doll, blink, amazon registry, shop personalized heart bracelets, toy, new movies on amazon prime, apple watch series 9, vibrator, apples never fall, amazn, ethernet cable, solo leveling, kingdom of the planet of the apes, amazon trade in, micro sd card, ring, mattress topper, the chi season 6, echo dot, jellycat, presidential debate, iphone 12 pro max, quiet on set, new balance 550, amazon product tester, sol de janeiro perfume, lola beltrán, oculus quest 2, pocket pussy, airpods 3, cancel amazon prime, nickelodeon documentary, amazon sign in, amazon fire tv, amazon wedding registry, creatine, grounding sheets, apple iphone 15 pro max, leave the world behind, amazon credit card login, amazon black friday, stocking, the housemaid, mean girls 2024, lingerie top, meta quest 2, the summer i turned pretty, check amazon gift card balance, apple watch ultra, prime photos, y2k outfits, coffee maker, amazon storefront, amazon prime membership, micellar water, best creatine, the last thing he told me, watch beetlejuice, powerbeats pro, amazon deals, amazon locker, atomic habits, backpack, girl on girl porn, amazon prime credit card, remarkably bright creatures, walmart.com, nizoral shampoo, apple watch se, shilajit, mouse pad, waffle maker, samsung s24 ultra, bbw, panda dunks, fan, internet chicks, snoop on a stoop, amason, amazon go, gaming chair, amazon com, smile amazon, yellowstone season 4, samsung galaxy s9, tv stand, espresso machine, asics gel 1130, uro probiotics, boobs, presumed innocent, project hail mary, chatgot, blink doorbell, prime student, most expensive car, mp3 player, treadmill, eclipse glasses, new balance 327, reacher, fourth wing, yeezy slides, amazon sidewalk, rose vibrator, mercury retrograde 2024, sex chair, gyatt, mujeres desnudas, laura loomer, google pixel 6, mother's day gifts, prime movies, iphone 15 plus, amazon household, miracle moo, them the scare, the boys, happy new year 2024, amazon synchrony, amazon prime free trial, dildo, amazon app store, amazon us, 99 math, rice cooker, v, heatless curls, ghostbusters frozen empire, toji fushiguro, tiny homes, solo stove, january 2024 calendar, nintendo switch oled, amazon kindle books, protein powder, doeda, the four agreements, orders, lmnt, clear ketchup, packing cubes, american fiction streaming, yellowjackets season 2, amazon fresh near me, smart watch, amazon prime photos, united states map, rowing machine, jewelry box, amazon.com/mytv, usb c charger, interview with the vampire season 2, metronome, versace eros, rasasi hawas, google pixel 2, alison botha, nugget ice maker, secret hitler, keto acv gummies, airpods case, led lights, tushy, amazon wish list, 3d printer, laptop, sex machine, clotrimazole cream, rose sex toy, prime, teanna trump, shop easter baskets, angel wings, customer service amazon, scooter, the watcher, handheld vacuum, prime tv, meal prep containers, paqui one chip challenge, books, 1-800-388-5512 amazon, amazon prime videos, amazon card, how much is amazon prime, best pillow for neck pain, amazon prime deals, headcam, billie eilish perfume, apple air tag, pawg, amazon kindle unlimited, amazon best sellers, kindred, iphone 13 mini, black seed oil, amazon customer support, letflix, shoe rack, santa hat, black friday deals 2024, matching christmas pajamas, ninja slushie machine, prime video login, watch oppenheimer, mini fridge, amazon. com, 7800x3d, echo show, amazonm, blink camera, prostate massager, aamzon, summer fridays lip balm, zyrtec, olipop, woobles, amazon first reads, amazon chat support, blackout curtains, the tote bag, prime amazon, yuji itadori, amazon student prime, hdmi splitter, goodr sunglasses, samsung s23, contact amazon customer service, my amazon account, amazon prime customer service, sex dolls, july 2024 calendar, the chosen season 4, the ministry of ungentlemanly warfare, longlegs, where to watch the summer i turned pretty, foam roller, usa sex guide, mapa de estados unidos, nuru massage, the summer i turned pretty season 2, erone, amazon vine, iphone 12 mini, amazon liquidation store, magnesium l-threonate, october 2024 calendar, headphones, amazon prime day deals, tylenol, call amazon customer service, a quiet place day one, fire kirin, ncis, vox machina season 3, we were the lucky ones, pokemon cards, american fiction, castor oil packs, dildos, shop women's spring dress, aquaphor, micro bikini, comixology, pink stanley cup, amazon delivery, towel warmer, amazon prime sign in, honey pack, paramount plus, amazon student, canelo vs berlanga, ninja air fryer, aazon, s24 ultra, amazon parent dashboard, fabric, multiplication chart, amazon my account, kindle unlimited books, audible amazon, dehumidifier, dior sauvage, blue light glasses, mediatakeout, dash cam, juwa, amazon contact,

What Are the Different Phases of Sleep?

When the sleep pressure is sufficient, and the biological clock gives the signal, the signs of falling asleep are felt (yawning, discomfort in the neck, chills, etc.).

Knowing how to spot them has many advantages because they are the first train of sleep arrival. Now is the time to go to bed!

Their appearance is linked to the activation of predominant biological mechanisms during sleep:

  • Cortisol (stress hormone) decreases
  • The heart rate drops,
  • Body temperature is reduced,
  • Synthesis of melatonin (sleep hormone) begins.

At the same time, all phenomena related to awakening decrease: hunger, thirst, but also social and sensory factors.

During the day, when we are awake, brain waves (indicators of brain activity) have a high frequency, and the body is activated continuously to respond to any requests and situations that arise.

When the first phase of sleep appears, that of falling asleep, these brain waves gradually decrease. The perception of the environment is more and more confused; the body begins to relax. This state is close to that encountered when we take a micro-nap and only last a few tens of minutes.

Slow Sleep

It includes two main stages: light slow sleep, and deep, slow sleep. It is characterized by decreased brain activity and relaxed muscle tone.

During the light sleep stage, the phenomena that appear become more pronounced, and we lose contact with the outside world over the minutes. In the beginning, we have a waltz-hesitation between sleeping and not sleeping, between micro-sleeps and micro-arousals. At this stage, muscle tone begins to decrease, and we can also notice this instability by the small movements of the body that can make us jump.

When the light sleep stage sets in, the eyes move less and less, the heart rate and breathing become slower and slower. On the other hand, the electrical activity of the brain is irregular. This stage alone accounts for half of the total sleep period.

During the deep sleep stage, the brain waves are slow and complete (between 0.5 and 2 Hz), which means that the brain’s activity is minimal. On the physical level, breathing is full and calm, muscle tone is weaker, and eye movements are absent, blood pressure no longer varies.

It is during this phase of sleep that it becomes difficult to wake the sleeping person.

What also characterizes deep sleep is that it is present mainly at the start of the night during the first two sleep trains. It is the most physically recovering stadium.

REM sleep

The last car in the sleep train is the paradoxical sleep train, so named because it presents a paradox between a brain that resumes a level of activity very close to, or even higher than that of waking, and an inert body. This phase of sleep represents about 25% of the total time of our nights.

The storm of paradoxical sleep follows the calm of deep sleep.

At this point, if the body is entirely inert, the heart rate, blood pressure, and breathing, on the other hand, become irregular. The eyes also start to move quickly, hence the REM stage (rapid eye movements) to describe REM sleep.

Moreover, REM sleep is commonly referred to as dream sleep. At this stage of sleep, dreams can sometimes be remembered. While such reminiscence is impossible for dreams that occur during slow sleep.

If deep sleep is present mainly at the beginning of the night, on the other hand, the duration of REM sleep is more and more important as the night progresses.

Likewise, if the physical recovery takes place during deep sleep, everything related to the brain happens mainly during REM sleep:

  • For example, procedural memorization (that of reasoning, know-how, learning gleaned during the day)
  • Or the maintenance of psychological balance.

Then, at the end of this paradoxical sleep, we are more or less aware of an awakening phase. We can then switch to a new sleep train or, on the contrary, not be able to fall asleep again.

These nocturnal awakenings or difficulty maintaining sleep, which mainly occurs at the end of a sleep cycle, can have multiple causes. Still, natural solutions exist to help get the night back to normal.