A multimodal 7T MRI and biomarker study reveals reversible brain changes following acute sleep deprivation.
Level 4 - case-series / case-control
Uncontrolled repeated-measures observational study evaluating pre- and post-intervention changes in a single cohort
PubMed 41232306 · doi:10.1016/j.sleep.2025.108663
What was done
Thirty healthy young adults (18 males, 12 females; mean age 28.0 ± 4.7 years, range 20–38) underwent multimodal 7-Tesla brain MRI, plasma biomarker analysis, and Psychomotor Vigilance Task (PVT) testing. Assessments occurred at three timepoints: baseline, after 24 hours of acute sleep deprivation, and following a 72-hour recovery window.
What was found
Acute sleep deprivation significantly increased total perivascular space (PVS) volume from 6711.5 mm³ to 7475.3 mm³ (p < 0.001), accompanied by decreased T1 relaxation times and shifts in quantitative susceptibility mapping (QSM) across multiple brain regions; these markers completely returned to baseline after recovery. Plasma levels of the pro-inflammatory marker MMP-9 increased from 52.3 pg/mL to 69.2 pg/mL (p < 0.05). Psychomotor vigilance worsened, with the slowest 10% reaction time increasing from 386.4 ms to 410.0 ms (p < 0.05), which also normalized after recovery.
Why it matters
This study provides high-resolution 7T MRI evidence that glymphatic disruption, fluid shifts, systemic inflammation, and cognitive deficits from acute sleep deprivation are dynamic and fully reversible after short-term recovery in young healthy adults.
Limits
The sample size is small (n = 30) and restricted to healthy young adults, limiting generalizability to older adults or individuals with chronic sleep disorders. There was no parallel non-deprived control group to account for potential circadian or scanner-drift artifacts, and the effects of chronic or repeated sleep loss were not evaluated.