“Cleaning your clock” takes on a literal meaning when it comes to Daylight Saving Time. This biannual clock adjustment does more than force you to reset your microwave — it essentially resets your body’s master clock, and not always gently. Nancy Rothstein, The Sleep Ambassador, regularly educates people on why time changes deserve serious attention from both a personal and public health perspective.
The human body operates on a roughly 24-hour cycle governed by the suprachiasmatic nucleus — a tiny cluster of neurons in the brain that serves as our master clock. This clock relies on consistent cues, primarily light and darkness, to stay synchronized. When we arbitrarily shift the clock forward or back, we disrupt this delicate timing system.
How Time Changes “Clean Your Clock”
- Sleep architecture is disrupted — The timing of REM and deep sleep phases shifts, meaning even if you’re in bed for 8 hours, the quality of your sleep suffers.
- Hormone timing goes haywire — Cortisol, melatonin, growth hormone, and other critical hormones are released on schedules that take days to readjust.
- Metabolism is affected — Insulin sensitivity changes, making the days after a time change particularly risky for blood sugar management.
- Mood and cognitive function dip — Concentration, memory, and emotional regulation all suffer during the adjustment period.
The best defense against the “clock cleaning” effect is gradual adjustment. Shift your schedule by 10–15 minutes per day in the week before the change. For more strategies, visit The Sleep Ambassador’s resources and explore personalized sleep consulting.