Do you sleep on a comfortable mattress but still wake up with neck or back pain? The problem might be closer than you think—right under your head, to be exact. Your pillow plays a key role in maintaining proper body alignment while you sleep. A pillow that’s too high or too low can throw your spine out of alignment, putting strain on your neck and back. But how do you figure out the best pillow loft for you? In this article, we’ll walk you through the key factors to consider so you can find the perfect thickness and loft for a good night’s sleep.

Why the right pillow height matters

A good pillow does more than just support your head. Its height determines how well your spine aligns while you sleep. Poor posture during sleep can lead to:

  • Neck pain
  • Stiff shoulders
  • Back pain
  • Poor sleep quality

When your body is properly supported, your muscles can relax, and your spine stays in a natural position. Research from 2021 shows that the right pillow height can reduce neck and back pain while improving sleep quality. Choosing the right loft for your pillow isn’t just a luxury—it’s essential for promoting healthy sleep.

How to find the ideal pillow height or loft for you

The best pillow height or loft for you depends on several factors, including your sleeping position, body type, and the mattress you sleep on.

1. Consider your sleeping position

  • Side sleepers pillow: Opt for a higher pillow loft (4–6 inches) that fills the space between your head and shoulder. This keeps your neck in a straight line.
  • Back sleepers pillow: Choose a medium loft (3–4 inches) that supports your neck without pushing your head too far forward.
  • Stomach sleepers pillow: Use a low loft (maximum 2.3 inches) or skip the pillow altogether to avoid straining your neck.

2. Take your body type into account

If you have broad shoulders, you’ll need a taller pillow loft to properly fill the gap between your head and the mattress. People with a slimmer build often do better with a thinner loft to avoid tilting their neck upward unnaturally.

3. Don’t forget your mattress

Your mattress affects how much your shoulders and hips sink in, which also impacts the position of your neck:

  • Soft mattresses: If your shoulders sink deeply into the mattress, a thinner pillow loft is usually sufficient since your head and shoulders are already closer to the mattress.
  • Firm mattresses: If your body doesn’t sink as much, a thicker loft will help support your neck properly.

How to tell if your pillow height is correct

Lie down in your preferred sleeping position and check if your head, neck, and spine form a straight line. If it feels uncomfortable, adjust the loft or try an adjustable pillow that allows you to customize its thickness.

The downsides of a pillow loft that’s too high or too low

Research shows that the wrong pillow height or loft doesn’t just feel uncomfortable; it also increases strain on your neck.

  • Too low: A pillow that’s too low won’t provide enough support, causing your neck muscles to overcompensate. This can lead to neck pain, stiff shoulders, and headaches. It can also throw your spine out of alignment, reducing your sleep quality.
  • Too high: A pillow that’s too high pushes your head upward, putting your neck in an unnatural position. This can cause pain and may even disrupt your breathing, leading to restless sleep.