Question at position 23 What is true of the REM sleep stages?REM is more dominant early in the night.Dreaming happens only in REM sleep.Infants have more REM than adults.There is only one REM stage every night.Clear my selection

Question

BlackTom AI · Accepted Answer

Infants spend a much higher proportion of their sleep time in REM (often called active sleep) than adults—about 50% in newborns versus roughly 20–25% in healthy adults.

1) Relevant concepts
- REM sleep: rapid eye movement sleep characterized by vivid dreaming, muscle atonia, and brain activity resembling wakefulness.
- Sleep architecture: sleep cycles of roughly 90 minutes that alternate between NREM (stages N1–N3) and REM; REM periods lengthen across the night.
- Developmental differences: the proportion of REM is higher in infancy and decreases with age.

2) Step-by-step reasoning
- Empirical findings show newborns often have ~50% of total sleep as REM; adults typically have ~20–25% REM.
- Example calculation to illustrate: if a newborn sleeps 16 hours, REM ≈ 50% × 16 = 8 hours. If an adult sleeps 8 hours and has 20% REM, REM ≈ 0.20 × 8 = 1.6 hours. These numbers show infants have substantially more REM time.

3) Intermediate calculations (shown above)
- Newborn: 0.50 × 16 = 8 hours REM.
- Adult: 0.20 × 8 = 1.6 hours REM.

4) Why the correct answer is correct
- Developmental neuroscience and polysomnography consistently report higher REM proportion in infants, supporting the choice “Infants have more REM than adults.”

5) Why the other options are incorrect
- “REM is more dominant early in the night.” Incorrect: REM periods are shorter early in the night and become longer and more dominant in the latter half of the night.
- “Dreaming happens only in REM sleep.” Incorrect: Most vivid dreams occur in REM, but dreaming (including less vivid or thought-like dreams) can and does occur during NREM stages as well.
- “There is only one REM stage every night.” Incorrect: Sleep cycles repeat every ~90 minutes, producing multiple REM periods across a typical night.

6) Conclusion
These points confirm the provided correct answer: Infants have more REM than adults.

Question at position 23 What is true of the REM sleep stages?REM is more dominant early in the night.Dreaming happens only in REM sleep.Infants have more REM than adults.There is only one REM stage every night.Clear my selection单项选择题

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