What are the EEG patterns of different stages of sleep?

Typically, as one goes to sleep, the low-voltage fast EEG pattern of wakefulness gradually gives way to slower frequencies, as NREM sleep goes from stage N1 (decrease in alpha) to stage N2 (spindles, K-complexes) to stage N3 (increasing amplitude and regularity of delta rhythm).

What EEG brain activity pattern is characteristic of Stage 3 sleep?

Stage 3 is often referred to as deep sleep or slow-wave sleep because this stage is characterized by low frequency (less than 3 Hz), high amplitude delta waves (Figure SC. 10).

What are the characteristics of the stages of sleep?

Frequently Asked Questions

  • NREM stage 1: Less than 10 minutes, begins right after falling asleep.
  • NREM stage 2: Lasts anywhere from 30 to 60 minutes.
  • NREM stage 3: Lasts between 20 to 40 minutes14.
  • REM sleep: About 10 minutes for the first period during sleep, then increasingly longer with later periods15.

What are the EEG patterns seen during REM sleep?

The EEG pattern resembles sleep stage 1, except that vertex sharp waves are not prominent in the REM stage. The EEG activities specific to REM sleep are the theta wave, the sawtooth wave,2-6 and the alpha wave. The theta wave is characterized by a frequency between 4 and 7 Hz and is dominant in central sites.

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.

How do EEG recordings brain waves change during the stages of sleep in terms of amplitude and frequency?

This pattern of brain wave activity resembles that of someone who is very relaxed, yet awake. As an individual continues through stage 1 sleep, there is an increase in theta wave activity. Theta waves are even lower frequency (4–7 Hz), higher amplitude brain waves than alpha waves.

What does the EEG record for stage 4 sleep look like?

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.

Which brain wave patterns occur during sleep stages 1 through 4?

What stage of sleep is beta waves?

REM sleep
And finally, last is Blood, for beta waves in REM sleep. So the mnemonic Bats Drink Blood can help you memorize the different stages of sleep and the corresponding brainwaves.

Are there 4 or 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.

During what stage of sleep wakefulness does an EEG show alpha waves?

stage 1 sleep
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. This pattern of brain wave activity resembles that of someone who is very relaxed, yet awake.

Which EEG brain wave patterns are found in stage 1 sleep?

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. This pattern of brain wave activity resembles that of someone who is very relaxed, yet awake.