EEG Changes Accompanying Successive Cycles of Sleep Restriction With and Without Naps in Adolescents.
Level 2 - randomized trial
Individual randomized controlled trial
PubMed 28329386 · doi:10.1093/sleep/zsx030
What was done
Fifty-seven adolescents (31 males, aged 15–19 years) were randomized to either a nap or no-nap group in a 15-day quasi-laboratory protocol simulating two school-week cycles. Each cycle consisted of sleep restriction (5-hour time-in-bed for five nights) followed by recovery (9-hour time-in-bed for two nights). The nap group was given a 1-hour afternoon nap opportunity at 14:00 after each restriction night. Sleep architecture was measured with polysomnography across nine nights and five nap episodes.
What was found
The abstract reports directional findings without numeric values or effect sizes. Afternoon naps reduced nocturnal homeostatic sleep pressure during restriction periods, reflected by longer N2 latency, lower total sleep time, reduced sleep efficiency, and lower slow-wave energy at night. Cumulative sleep debt developed in both groups, indicated by higher total sleep time, higher sleep efficiency, and decreased wake after sleep onset during recovery nights compared to baseline, with greater changes observed in the no-nap group. Two nights of recovery sleep did not restore sleep architecture to baseline in either group, and sleep efficiency, REM sleep, and non-REM sleep increased while N2 latency decreased further during the second restriction cycle.
Why it matters
This study demonstrates that weekend-like recovery sleep and short daytime naps cannot fully compensate for repeated weekly sleep restriction in adolescents, emphasizing the necessity of adequate nightly sleep duration.
Limits
The abstract provides no quantitative values, confidence intervals, or p-values. The sample size is modest (n = 57) and conducted in a quasi-laboratory hostel setting, which may not fully reflect free-living conditions or long-term behavioral and metabolic outcomes.
Cited by
- supports Taking long daytime naps reduces accumulated homeostatic sleep drive needed to fall asleep and stay asleep at night.