Morning-Heavy Pattern vs. Sleep Deprivation

Morning-heavy pattern is often attributed to sleep deprivation, but the two are not identical.

Sleep deprivation reflects insufficient or disrupted sleep.
Its effects are typically global and persistent throughout the day.

Morning heaviness, by contrast, may improve within hours of waking,
even when sleep duration and quality appear adequate.

When heaviness lifts with time rather than rest, the issue is timing, not sleep loss.