For most adults the answer is one, and the more useful question is which one. Stacking a second pillow is almost always a workaround for a pillow that is the wrong height, a mattress that is the wrong firmness, or a sleep position that changed and a pillow that did not. Here is how to work out what you actually need.
The short answer by sleep position
Your head should sit so your neck stays in roughly the same line it holds when you are standing with good posture. Not tipped up toward the ceiling, not dropped down toward the mattress. The number of pillows that achieves that depends almost entirely on how you lie.
- Side sleepers: one thick pillow. The gap between your ear and the mattress is the widest of any position, roughly the width of your shoulder, so you need real loft to fill it. Many side sleepers reach for two thin pillows because they have never owned one pillow tall enough.
- Back sleepers: one medium pillow. You are filling the smaller hollow at the base of the skull, not a shoulder-width gap. Two pillows here pushes your chin toward your chest, which is one of the more common causes of morning neck stiffness.
- Stomach sleepers: one very thin pillow, or none. Any real loft forces your neck into extension for hours at a time. If you sleep on your stomach and wake with a sore neck, subtracting a pillow usually helps more than replacing one.
- Combination sleepers: one medium-loft pillow that is adjustable, or a shredded fill you can add to and remove from, so it works in more than one position.
When two pillows genuinely make sense
There are real cases where more than one pillow under the head is correct, and more where a second pillow belongs somewhere other than under your head.
Under the head
Acid reflux and some breathing conditions benefit from sleeping with the upper body raised. Two stacked pillows is the cheap version of this. It works, but poorly, because the wedge stops at your shoulders and your spine bends at the wrong point. An adjustable base that lifts from the hips up does the same job without the kink, which is why so many reflux sufferers end up on one. Our adjustable bed collection covers the options.
Everywhere else
These are the second pillows worth owning:
- Between the knees if you sleep on your side. It stops the top leg from dragging your hip and lower back out of alignment, and it is the single most effective cheap fix for side-sleeper hip pain.
- Under the knees if you sleep on your back. It takes tension out of the lumbar spine.
- Under one hip if you sleep on your stomach and cannot break the habit. It reduces the arch in your lower back.
- Hugged against the chest if you sleep on your side. It keeps the top shoulder from rolling forward.
Your mattress changes the answer
Pillow height is not an isolated variable. It depends on how far your shoulder sinks into the mattress, and that is a property of the bed, not the pillow.
On a soft or plush mattress, your shoulder drops further in, which narrows the gap your pillow has to fill. Side sleepers who move from a firm bed to a plush one often find their trusted pillow is suddenly too tall. On a firm mattress the opposite happens: the shoulder stays proudly on the surface and the gap widens, so you need more loft than you did before.
This is why buying a pillow in isolation so often disappoints. If you have just switched mattresses and your neck hurts, the pillow is probably the thing that needs to change, not the mattress. If the pillow is right and your shoulder still aches, the mattress firmness may be the culprit. Our soft mattresses for pressure relief are worth a look if your shoulder is taking the load on a bed that will not let it sink.
How to tell you have the wrong number
The symptoms are specific enough to diagnose yourself.
- Too much loft: stiffness at the front of the neck and upper chest, waking with your chin near your chest, tingling in the arms, or a habit of shoving the pillow aside in the night.
- Too little loft: aching on the outside of the neck and top of the shoulder, waking with a hand tucked under the pillow (your body improvising the height it needs), or reaching for a second pillow half asleep.
- Right loft, wrong pillow: comfortable at bedtime, flat and unsupportive by 3am. That is a fill that collapses, not a height problem.
Give any change three or four nights before judging it. Your neck adapts to whatever it has been doing for months, and the first two nights on a correct pillow can feel worse than the wrong one.
What about decorative pillows?
Styling and sleeping are separate jobs. A standard queen bed usually looks right with two sleeping pillows plus two Euro shams and one lumbar pillow, and a king with two sleeping pillows plus three Euros. None of those decorative pieces should end up under your head at night. Keep a bench or a basket at the foot of the bed so they have somewhere to go, and buy your sleeping pillows for your neck rather than for the photograph.
Frequently asked questions
How many pillows should you sleep on?
One, for the large majority of adults. The exception is medical: reflux, congestion or certain breathing conditions can justify elevation, and an adjustable base does that better than stacking. If you are using two because one is not tall enough, replace the pillow rather than adding to it.
How many pillows should I sleep with as a side sleeper?
One high-loft pillow under the head and one between the knees. Side sleeping is the position most sensitive to loft, because the shoulder-width gap is the largest to fill, and it is also the position that benefits most from knee support. See our guide to the best pillows for side sleepers.
Is it better to sleep without a pillow?
Only for stomach sleepers, and only sometimes. Lying face down already extends the neck, and a pillow makes it worse, so going without can genuinely help. For side and back sleepers, no pillow leaves the head dropping below the line of the spine, which creates the same strain in the opposite direction.
How many pillows on a queen bed?
Two standard or queen sleeping pillows fit the 60 inch width comfortably. Add decorative pillows for looks if you want them, but two is the functional number. Our pillow sizes guide covers which size fits which bed.
How many pillows should one person use?
One under the head, plus one positional pillow (knees, hips or chest) depending on how you sleep. Two well-chosen pillows doing two different jobs beats three pillows all fighting over the same one.
How often should you replace a pillow?
Roughly every one to two years for most fills, longer for latex and high-density foam. A pillow that stays folded when you bend it in half has lost its structure and is no longer holding your neck anywhere. See how often you should replace your pillow for the full test.
Get the pillow and the mattress working together
If you have tried three pillows and your neck still hurts, the bed underneath is usually part of the story. Come lie down at any of our five Los Angeles showrooms and test pillows on the mattress you actually sleep on, or the one you are considering. We deliver same day across the metro and back every mattress with a free 120-night comfort guarantee. Not sure what firmness suits you? Start with our sleep quiz, or read our guide on how to choose a pillow.
