Decreasing N3 across successive NREM sleep cycles, with higher N3 after sleep deprivation, best reflects which homeostatic process?

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Multiple Choice

Decreasing N3 across successive NREM sleep cycles, with higher N3 after sleep deprivation, best reflects which homeostatic process?

The pattern reflects both increasing and dissipating sleep pressure and circadian timing shaping sleep depth. Deep NREM sleep (N3) rises when wakefulness has been extended because homeostatic sleep pressure (Process S) accumulates, and after sleep deprivation you see more N3 as the system works to recover. As sleep continues through successive NREM cycles, that homeostatic pressure is gradually dissipated, so N3 decreases across cycles. At the same time, the circadian system (Process C) governs when sleep occurs and modulates how deeply you sleep at different circadian phases, influencing the distribution of N3 across the night. Because both processes contribute to the observed changes in N3, the best answer is that both are involved.

The pattern reflects both increasing and dissipating sleep pressure and circadian timing shaping sleep depth. Deep NREM sleep (N3) rises when wakefulness has been extended because homeostatic sleep pressure (Process S) accumulates, and after sleep deprivation you see more N3 as the system works to recover. As sleep continues through successive NREM cycles, that homeostatic pressure is gradually dissipated, so N3 decreases across cycles. At the same time, the circadian system (Process C) governs when sleep occurs and modulates how deeply you sleep at different circadian phases, influencing the distribution of N3 across the night. Because both processes contribute to the observed changes in N3, the best answer is that both are involved.

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