Which of the following are FALSE? 1- length of time in each REM sleep stage incr

Question

Which of the following are FALSE?
1- length of time in each REM sleep stage increases as the night goes on.
2- Respiratory rate decreases during REM sleep.
2- Delta rhythms dominate in stage 3 of non-REM sleep.
Which of the following are FALSE?
1- length of time in each REM sleep stage increases as the night goes on.
2- Respiratory rate decreases during REM sleep.
2- Delta rhythms dominate in stage 3 of non-REM sleep.

1- length of time in each REM sleep stage increases as the night goes on.
2- Respiratory rate decreases during REM sleep.
2- Delta rhythms dominate in stage 3 of non-REM sleep.

Explanation / Answer

There are 4 stages of sleep:

Of this, during stage 3 sleep:

This stage was previously divided into stages three and four. Deep, slow brain waves known as delta waves or rhythms begin to emerge during stage 3 sleep. This stage is also sometimes referred to as delta sleep.

During this stage, people become less responsive and noises and activity in the environment may fail to generate a response. It also acts as a transitional period between light sleep and a very deep sleep.

So, option '2-Delta rhythms dominate in stage 3 of non-REM sleep' is TRUE, because delta waves or rhythms emerge during stage 3 sleep.

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During REM sleep:

Most dreaming occurs during the fourth stage of sleep, known as rapid eye movement (REM) sleep. REM sleep is characterized by eye movement, increased respiration rate and increased brain activity. Research shows that humans spend approximately 20 percent of their total sleep in this stage.

REM sleep is also referred to as paradoxical sleep because while the brain and other body systems become more active, muscles become more relaxed. Dreaming occurs due to increased brain activity, but voluntary muscles become immobilized.

So, option '2-Respiratory rate decreases during REM sleep' is FALSE, because it actually increases during that stage.

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It is important to realize that sleep does not progress through these stages in sequence. Sleep begins in stage 1 and progresses into stages 2, and 3. After stage 3 sleep, stage 2 sleep is repeated before entering REM sleep. Once REM sleep is over, the body usually returns to stage 2 sleep. Sleep cycles through these stages approximately four or five times throughout the night.

On average, we enter the REM stage approximately 90 minutes after falling asleep. The first cycle of REM sleep might last only a short amount of time, but each cycle becomes longer. REM sleep can last up to an hour as sleep progresses.

So, option '1-length of time in each REM sleep stage increases as the night goes on' is FALSE because on average, we enter the REM stage approximately 90 minutes after falling asleep. Once REM sleep is over, the body usually returns to stage 2 sleep.

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