science

REM rebound

REM rebound is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand REM rebound rather than just read about it. In short: REM rebound is the lengthening and increasing frequency and depth of rapid eye movement (REM) sleep which occurs after periods of sleep deprivation. When people have been prevented from experiencing REM, they take less time than usual to attain the REM state.

Key takeaways

REM rebound belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect REM rebound to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of REM rebound from memory before moving on to harder problems.

Reference excerpt

REM rebound is the lengthening and increasing frequency and depth of rapid eye movement (REM) sleep which occurs after periods of sleep deprivation. When people have been prevented from experiencing REM, they take less time than usual to attain the REM state. When people are unable to obtain an adequate amount of REM sleep, the pressure to obtain REM sleep builds up. When the subject is able to sleep, they will spend a higher percentage of the night in REM sleep. After early research connected rapid eye movement with dreaming and established that it made up about 20% of normal human sleep, experimenters started depriving test subjects of only REM sleep, to test its unique importance. Every time a subject's electroencephalogram and eye movements indicated the beginning of REM sleep, the experimenter would thoroughly wake them for several minutes. As this "dream deprivation" continued, tendency to initiate REM increased, and the subjects were woken up more and more times each night. The subjects became irritable, anxious, and hungry, and several left the study early. After five nights, the remaining subjects were allowed to sleep undisturbed, and showed a significant increase in percentage of sleep devoted to REM: from an average of 19.4% to an average of 26.6%. These effects were significant in comparison with a control group woken up on an equal number of occasions each night, at arbitrary times. The fact that REM rebound exists shows that sleep and achievement of specific sleep stages are needed by the brain. In some marine mammals, such as dolphins and fur seals, when one brain hemisphere is deprived of REM sleep, only the deprived hemisphere will go into REM rebound. The other hemisphere will be unaffected. REM rebound is common to those who take certain sleeping aids and it is also often seen in the first few nights after patients with sleep apnea are placed on CPAP. Alcohol can also affect REM sleep; it suppresses it during the first half of the night, leading to a rebound four to five hours after sleep onset. Although alcohol can decrease the amount of time it takes to fall asleep, it will cause a disruption in the sleep cycles. REM sleep is decreased during the first half of the sleep period and stage 1 sleep is increased in the second half of the sleep period. Most antidepressants, in particular selective serotonin re-uptake inhibitors (SSRIs), such as citalopram and paroxetine, are potent inhibitors of REM sleep and may also cause a REM rebound on discontinuation.

See also Sleep Rapid eye movement sleep (REM) Polysomnography Sleep disorder Sleep deprivation

References

Worked examples

Example 1 — a first encounter with REM rebound

Start with the simplest possible case. Write down what REM rebound claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to REM rebound before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about REM rebound ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of REM rebound

In research: REM rebound appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses REM rebound in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: REM rebound is common in secondary-school and first-year university syllabi. It links to neighbouring topics Sleep physiology, Sleeplessness and sleep deprivation, so understanding it makes those chapters shorter.
In everyday life: Look for REM rebound outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study REM rebound in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what REM rebound means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain REM rebound out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is REM rebound in simple terms?

Why does REM rebound matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study REM rebound?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on REM rebound.