From early adulthood to midlife, what happens to slow-wave sleep (N3) and which stages replace it?

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Multiple Choice

From early adulthood to midlife, what happens to slow-wave sleep (N3) and which stages replace it?

As people move from early adulthood to midlife, slow-wave sleep declines. The deep sleep stage N3, which features delta waves and is most restorative, becomes shorter and less prominent. The sleep that replaces it is mainly lighter non-REM sleep, particularly stages N1 and N2, which are easier to wake from and less restorative. REM sleep doesn’t typically take over the role of N3 in this aging process; instead, the overall pattern shifts toward more time in lighter sleep. So, N3 decreases and is replaced by N1 and N2.

As people move from early adulthood to midlife, slow-wave sleep declines. The deep sleep stage N3, which features delta waves and is most restorative, becomes shorter and less prominent. The sleep that replaces it is mainly lighter non-REM sleep, particularly stages N1 and N2, which are easier to wake from and less restorative. REM sleep doesn’t typically take over the role of N3 in this aging process; instead, the overall pattern shifts toward more time in lighter sleep. So, N3 decreases and is replaced by N1 and N2.

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