What are the characteristics of Stage 1 sleep quizlet?

Stage 1 is when the sleeper may experience a hypnic jerk. Hypnic jerks are quite common in stage 1. Approximately 5-10 minutes. EEG pattern shows a decrease in ALPHA WAVE production as these brain waves are replaced by more irregular, medium frequency, THETA WAVES, which have a mixture of high and low amplitude.

Which waves are characteristic of stage 1 or light sleep?

In terms of brain wave activity, stage 1 sleep is associated with both alpha and theta waves. The early portion of stage 1 sleep produces alpha waves, which are relatively low frequency (8–13Hz), high amplitude patterns of electrical activity (waves) that become synchronized (Figure SC. 8).

What is one characteristic of the NREM 1 sleep stage?

Three stages make up non-REM sleep. Stage 1: This stage of light sleeping lasts for five to 10 minutes. Everything starts to slow down, including your eye movement and muscle activity.

What are the 4 characteristics of sleep?

Sleep has been traditionally divided into 4 categories: awake, light, deep, and REM sleep. Each one plays an essential role in maintaining your mental and physical health. Note: As you’re reading about sleep, you may also see the terms “NREM” or “Stages 1-4.” These are simply other terms for the phases of sleep.

What happens during stage 1 sleep psychology quizlet?

Stage 1 can be considered a transition period between wakefulness and sleep. In Stage 1, the brain produces high amplitude theta waves, which are very slow brain waves. This period of sleep lasts only a brief time (around 5-10 minutes).

What is Stage 2 of sleep?

Stage 2 / N2

During stage 2, the body enters a more subdued state including a drop in temperature, relaxed muscles, and slowed breathing and heart rate. At the same time, brain waves show a new pattern and eye movement stops.

What is the first stage of sleep?

Stage 1: Non-REM sleep

Stage 1 occurs when you first fall asleep. As your body enters light sleep, your brain waves, heart rate, and eye movements slow down. This phase lasts for about 7 minutes.

What are the 5 stages of sleep?

Sleep occurs in five stages: wake, N1, N2, N3, and REM. Stages N1 to N3 are considered non-rapid eye movement (NREM) sleep, with each stage a progressively deeper sleep. Approximately 75% of sleep is spent in the NREM stages, with the majority spent in the N2 stage.

What occurs during stage 1 sleep both our respiration and heartbeat quicken?

NREM Stages of Sleep. The first stage of NREM sleep is known as stage 1 sleep. 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.

What stage of sleep is delta waves?

In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (1–4 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 waves are in each stage of sleep?

As a person transitions from being awake to falling asleep, alpha waves are replaced by theta waves. Sleep spindles and K-complexes emerge in stage 2 sleep. Stage 3 and stage 4 are described as slow-wave sleep that is marked by a predominance of delta waves.

What stage of sleep is beta waves?

Stage One non-REM sleep begins when you first lie down and close your eyes. After a few sudden, sharp muscle contractions in the legs, the muscles relax. Then, as you continue falling asleep, the rapid beta waves of wakefulness are replaced by the slower alpha waves of someone who is relaxed with their eyes closed.

Which brain waves are irregular and associated with stage 1 sleep?

In terms of brain wave activity, stage 1 sleep is associated with both alpha and theta waves.

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.

Which stage of sleep is most important?

Scientists agree that sleep is essential to health, and while stages 1 to 4 and REM sleep are all important, deep sleep is the most essential of all for feeling rested and staying healthy.

What stage of sleep is dreaming?

REM sleep
Most of your dreaming occurs during REM sleep, although some can also occur in non-REM sleep. Your arm and leg muscles become temporarily paralyzed, which prevents you from acting out your dreams. As you age, you sleep less of your time in REM sleep. Memory consolidation most likely requires both non-REM and REM sleep.

What is the lightest stage of sleep?

Stage 1
NREM sleep

N1 (Stage 1) – The lightest stage of sleep, when you are between being awake and asleep.

What are the 5 stages of sleep?

Sleep occurs in five stages: wake, N1, N2, N3, and REM. Stages N1 to N3 are considered non-rapid eye movement (NREM) sleep, with each stage a progressively deeper sleep. Approximately 75% of sleep is spent in the NREM stages, with the majority spent in the N2 stage.