REALMS OF SLEEP

1950s Little was known about the physiology, or function, of sleep Little was known about the physiology, or function, of sleep Nathaniel Kleitman and Eugene Aserinsky Nathaniel Kleitman and Eugene Aserinsky Do people’s eye continue to roll around throughout sleep as they do when one falls asleep?Do people’s eye continue to roll around throughout sleep as they do when one falls asleep? Measured brain activity while sleeping with an EEG machineMeasured brain activity while sleeping with an EEG machine

REM vs NREM: What Are They? During sleep, periods of REM alternate with periods of NREM. During sleep, periods of REM alternate with periods of NREM. What does REM stand for? What does REM stand for?______________________________ What do you think NREM stands for? What do you think NREM stands for?

What happens when you sleep? When you first hop into bed and relax, your brain emits ALPHA WAVES When you first hop into bed and relax, your brain emits ALPHA WAVES Regular, slow rhythm/high altitudeRegular, slow rhythm/high altitude Gradually, the waves Gradually, the waves slow down and you drift into 4 distinct stages of NREM sleep

4 Stages of NREM Sleep _____________ _____________ Drifting on the edge Drifting on the edge of consciousness If awakened, you If awakened, you may recall fantasies or a few visual images

4 Stages of NREM Sleep _____________ _____________ SLEEP SPINDLES are emitted in short, rapid bursts from the brain SLEEP SPINDLES are emitted in short, rapid bursts from the brain Minor noises won’t wake you up Minor noises won’t wake you up

4 Stages of NREM Sleep _____________ _____________ DELTA WAVES are emitted DELTA WAVES are emitted Breathing and pulse slow, muscles relax, and you are difficult to wake up Breathing and pulse slow, muscles relax, and you are difficult to wake up

4 Stages of NREM Sleep _____________ _____________ Deep sleep Deep sleep Most likely to walk or Most likely to walk or talk in your sleep

ORDER OF SLEEP REALMS STAGE 1 STAGE 1 STAGE 2 STAGE 2 STAGE 3 STAGE 3 STAGE 4 STAGE 4 STAGE 3 STAGE 3 STAGE 2 STAGE 2 STAGE 1 STAGE 1

REM SLEEP Twitching in fingers and faceTwitching in fingers and face Muscles go limp, restricting movementMuscles go limp, restricting movement Arousal hormones freely releasedArousal hormones freely released

REM SLEEP Most likely to ______________ during this stage Most likely to ______________ during this stage You CAN dream in other stages but it is much more likely during REMYou CAN dream in other stages but it is much more likely during REM

SLEEP PATTERNS During a normal During a normal night, a sleeping person will alternate between stages of REM and NREM in no particular order

REVIEW 1) The sleep disorder characterized by difficulty in falling or staying asleep. 2) A biological rhythm that occurs every 24 hours is known as a _____. 3) The correct term for “jet lag” is _____. 4) In which stage of sleep are you most likely to sleep walk? 5) What does REM stand for?

REVIEW 6) The sleep disorder characterized by sudden daytime attacks of sleepiness or sleep 7) In which stage of sleep is dreaming most likely 8) The sleep disorder characterized by a sudden inability to breathe 9) Awareness of one’s self and the environment is defined as _________. 10) What is the rare, genetic disorder that leads to death from lack of sleeping?