Table of Contents
During which stage of sleep does the person report they were just drifting?
Stage 1 NREM sleep is the initial stage of sleep during which the individual drifts in and out of light sleep and can easily be awakened. The brain activity during this sleep stage is associated with alpha and theta waves, reduced activity of the voluntary muscles, and slow eye movement.
When a person in stage 1 sleep suddenly awakens with a start?
During stage 1 sleep, the brain is dominated by theta waves. The sleeper is in a very light sleep with closed eyes, but the sleep is very light and it is easy to be woken up. Indeed, sometimes a person wakes up with a start in a phenomenon called a hypnic jerk
In what stage do sleep spindles begin to appear on the EEG machine?
Delta waves typically occur during REM sleep. Sleep spindles begin to occur during Stage 2 sleep
Which psychological perspective might advance the argument that our sleep patterns evolved as an adaptive response to predatory risks which are higher during?
Another evolutionary hypothesis of sleep holds that our sleep patterns evolved as an adaptive response to predatory risks, which increase in darkness.
What stage of sleep do you drift in and out of sleep?
During stage 1, which is light sleep, we drift in and out of sleep and can be awakened easily. Our eyes move very slowly and muscle activity slows. People awakened from stage 1 sleep often remember fragmented visual images.
What is Stage 4 of sleep?
In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (14 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.
What is stage 3 of sleep?
Stage N3 is deep sleep and lasts about 20 to 40 minutes. During this stage, delta brain activity increases and a person may have some body movements. It is very hard to wake up someone in stage N3.
What are the 5 stages of sleep cycle?
In general, each cycle moves sequentially through each stage of sleep: wake, light sleep, deep sleep, REM, and repeat. Cycles earlier in the night tend to have more deep sleep while later cycles have a higher proportion of REM. By the final cycle, your body may even choose to skip deep sleep altogether.
When a person in stage 1 sleep suddenly awakens with a start psychologists say they have experienced a quizlet?
During stage 1 sleep, the brain is dominated by theta waves. The sleeper is in a very light sleep with closed eyes, but the sleep is very light and it is easy to be woken up. Indeed, sometimes a person wakes up with a start in a phenomenon called a hypnic jerk.
What happens during Stage 1 of sleep?
During stage 1, which is light sleep, we drift in and out of sleep and can be awakened easily. Our eyes move very slowly and muscle activity slows. People awakened from stage 1 sleep often remember fragmented visual images.
What happens if you wake up during REM sleep?
The root cause of sleep inertia is clear Sleep inertia is the result of sudden awakening during REM sleep. When you wake up during REM, you still have high levels of melatonin, causing sleepiness. The longer you sleep, the higher level of melatonin is observed during REM stage.
What is the name for a burst of activity on an EEG in the early stages of sleep?
Theta waves still dominate the activity of the brain, but they are interrupted by brief bursts of activity known as sleep spindles ([link]).
In what stage of sleep do sleep spindles appear group of answer choices?
When sleep spindles appear on an EEG readout, that shows a person has fallen asleep. Sleep spindles may be present in all stages of NREM, but they are most prevalent in stage 2 sleep 6, which we tend to enter for the first time shortly after falling asleep. Sleep spindles do not occur during REM sleep.
What is the EEG wave pattern for stage 4 sleep?
In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (14 Hz), high-amplitude fluctuations called delta waves, the characteristic slow waves for which this phase of sleep is named.
What are the stages of sleep revealed by an EEG?
Sleep is generally divided into 2 broad types: nonrapid eye movement (NREM) sleep and REM sleep. Based on EEG changes, NREM is divided further into 4 stages (stage I, stage II, stage III, stage IV)
Which psychological perspective might advance the argument that our sleep patterns evolved as an adaptive?
Another evolutionary hypothesis of sleep holds that our sleep patterns evolved as an adaptive response to predatory risks, which increase in darkness.
Which theory states that the purpose of sleep is an adaptive response to predatory risks which increase in darkness quizlet?
Evolutionary theory, also known as the adaptive theory of sleep, suggests that periods of activity and inactivity evolved as a means of conserving energy. According to this theory, all species have adapted to sleep during periods of time when wakefulness would be the most hazardous.
What does the social cognitive theory of hypnosis suggest?
Taking a different approach to explain hypnosis, the social-cognitive theory of hypnosis sees people in hypnotic states as performing the social role of a hypnotized person. As you will learn when you study social roles, people’s behavior can be shaped by their expectations of how they should act in a given situation
What disorder is characterized by an individual leaving his or her bed while still asleep?
Confusional arousals are also known as Elpenor syndrome. Sleepwalking: Also known as somnambulism, sleepwalking occurs when people get out of bed while still asleep but exhibit limited awareness or responsiveness to their surroundings. They may exhibit other complex behaviors such as sorting clothes.
What stage of sleep is drifting?
Stage 1 sleep is a transitional phase that occurs between wakefulness and sleep, the period during which we drift off to sleep. During this time, there is a slowdown in both the rates of respiration and heartbeat.
Do you go in and out of REM sleep?
Usually, REM sleep arrives about an hour and a half after you go to sleep. The first REM period lasts about 10 minutes. Each REM stage that follows gets longer and longer.
What happens during stage 3 of sleep?
During this stage, your muscles become more relaxed and you may begin to have slow-wave (delta) brain activity. Stage N3 is deep sleep and lasts about 20 to 40 minutes. During this stage, delta brain activity increases and a person may have some body movements. It is very hard to wake up someone in stage N3.
What happens in stage 4 of sleeping?
By stage 4, the brain produces delta waves almost exclusively. It is very difficult to wake someone during stages 3 and 4, which together are called deep sleep. There is no eye movement or muscle activity.
Is there a stage 4 sleep?
In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (14 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.
How long do we spend in stage 4 sleep?
| Sleep Stages | Type of Sleep | Normal Length |
| Stage 1 | NREM | 1-5 minutes |
| Stage 2 | NREM | 10-60 minutes |
| Stage 3 | NREM | 20-40 minutes |
| Stage 4 | REM | 10-60 minutes |
