What Is Circadian Rhythm, and Does Your Pillow Affect It?
Your circadian rhythm is the body's internal clock, a roughly day-long cycle that times when you feel sleepy and when you feel alert. Light is its strongest cue, and a pillow does not set it.
Key takeaways
- Light, regular wake times, meals and activity keep your body clock on schedule.
- A pillow does not shift your clock. A well-fitted pillow addresses a different problem: neck position and comfort once you are asleep.
- If you consistently cannot fall asleep or wake at the times your life requires, talk to your physician.
What sets your circadian rhythm?
A small area of the brain keeps the clock and adjusts it mainly to light. Bright light in the morning signals daytime. Dim light in the evening lets sleepiness build. Meal timing, exercise and a steady sleep schedule add to the signal.
What throws it off?
Irregular bedtimes, bright screens late at night, travel and shift work all push the clock out of step with your day. We cover three of these in separate posts:
What helps keep it steady?
- Wake at a consistent time. This anchors the clock more than bedtime does.
- Get daylight early. Go outside or sit near a bright window in the morning.
- Dim the evening. Lower the lights and set screens aside before bed.
More habits are on our tips for a better sleep page.
Does your pillow matter for your body clock?
Not for timing. We know of no study showing that a pillow changes circadian rhythm, and we do not claim it. What a pillow can affect is whether you stay comfortable once the clock says it is time to sleep. A pillow that is too high or too low tilts the neck for hours. That can mean waking up stiff or shifting all night. Our post on how to tell if your pillow is the wrong height lists the signs.
A pillow is not a treatment for insomnia or a sleep disorder. If good habits do not help, see your own provider.
How does Pillowise approach pillow fit?
A pillow should fit the body, like a shoe size. We take three measurements: shoulder width, neck circumference and neck height. We add your sleeping position (side, back or stomach) and mattress firmness (soft, medium or firm). The Pillowise algorithm then picks one of 7 sizes. The right size is only part of good sleep, but it is the part you can fit to your body.
Find a provider near you
Pillowise is sold through licensed chiropractors, physical therapists and massage therapists. The measurement is free at every provider. Find a Pillowise provider near you and book your free measurement.
Providers: you can register as a reseller on our chiropractor, PT and LMT page.
Thijs van der Hilst, physiotherapist
Co-founder of Pillowise
