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Both REM And Non‑REM Matter
- Sleep stages (REM and non-REM) serve different restorative functions and both matter.
- Severe sleep deprivation clearly harms immunity and cognition, so sleep is essential for health.
Sleep Needs Vary By Person And Age
- Recommended sleep varies by age and individual biology rather than one fixed number.
- The National Sleep Foundation gives ranges (e.g., 7–9 for adults), not a universal eight hours.
Listen To Your Body's Sleep Signal
- Trust your body's signal: if you consistently feel alert on seven hours, that may be enough.
- Conversely, needing nine hours occasionally is normal and not inherently unhealthy.