Finding the Best Sleeping Position for Your Spine
The position you sleep in has a direct impact on your spinal health. Considering you spend roughly a third of your life asleep, that is a lot of hours either supporting or straining your back. If you wake up with stiffness, aches, or pain, your sleeping position could be a significant contributing factor.
The ideal sleeping position keeps your spine in a neutral alignment, meaning the natural curves of your neck, upper back, and lower back are supported without being pushed into unnatural angles. Here is what the evidence says about the most common sleeping positions and how each one affects your spine.
Back Sleeping
Sleeping on your back is generally considered one of the best positions for spinal health. When you lie flat on your back, your weight is distributed evenly across the widest surface area of your body, which reduces pressure points and allows your spine to rest in a relatively neutral position.
Making Back Sleeping Work
The key to good spinal alignment on your back is having the right pillow. Your pillow should support the natural curve of your neck without pushing your head too far forward or allowing it to drop too far back. A medium-loft pillow that cradles the neck is usually ideal.
Placing a small pillow or rolled towel under your knees can also help. This slightly elevates your knees and takes pressure off your lower back by allowing the natural lumbar curve to be maintained more easily.
Who Should Avoid Back Sleeping
People who snore or have sleep apnoea may find that back sleeping makes these conditions worse, as gravity can cause the tongue and soft tissues to fall backward and partially obstruct the airway. If this is a concern, side sleeping may be a better option.
Side Sleeping
Side sleeping is the most common sleeping position and can be excellent for your spine when done correctly. It keeps the airway open (making it better for snorers), reduces acid reflux, and can be very comfortable with the right support.
Getting Side Sleeping Right
The challenge with side sleeping is keeping your spine aligned. Without proper support, your upper body can twist and your hips can tilt, creating strain on your lower back and neck.
A firm enough pillow to fill the gap between your shoulder and head is essential. Your head should be level with your spine, not tilted up or down. A pillow that is too thin allows your head to drop, straining your neck, while one that is too thick pushes your head upward.
Placing a pillow between your knees is one of the most effective things side sleepers can do for their spine. It keeps your hips stacked evenly, prevents your upper leg from pulling your pelvis out of alignment, and reduces rotational stress on your lower back.
Left Side vs Right Side
There is some evidence that sleeping on your left side may be slightly better for digestion and can reduce acid reflux symptoms. For spinal health specifically, both sides are generally equivalent, though you may find one side more comfortable than the other depending on your body and any existing conditions.
Stomach Sleeping
Stomach sleeping is generally considered the least favourable position for spinal health. When you sleep on your stomach, your head is turned to one side for extended periods, which puts significant strain on your neck. Your lower back can also arch excessively, especially on a soft mattress, creating compression in the lumbar spine.
If You Cannot Give Up Stomach Sleeping
If you are a committed stomach sleeper, there are some ways to reduce the strain. Use a very flat pillow or no pillow at all to minimise neck rotation. Place a thin pillow under your pelvis to reduce lower back arching. Try to gradually transition to side sleeping by starting on your side and allowing yourself to shift naturally during sleep.
The Role of Your Mattress
Your sleeping position and your mattress work together to determine spinal alignment. A mattress that is too firm can create pressure points at the hips and shoulders (particularly for side sleepers), while one that is too soft can allow your body to sink unevenly, pulling your spine out of alignment.
Medium-firm mattresses are often recommended for spinal health, as they provide enough support to maintain alignment while offering enough give to accommodate the body's natural curves. However, the best firmness depends on your body weight, sleeping position, and personal comfort preferences.
Signs Your Sleeping Position May Be Causing Problems
If you regularly wake up with neck stiffness, lower back pain, numbness in your arms or hands, headaches that develop during the night, or hip pain, your sleeping position may be contributing. These symptoms can often be improved by adjusting your position, pillow, or mattress support.
"I switched from stomach sleeping to side sleeping with a pillow between my knees and the difference in my back pain was remarkable. It took a couple of weeks to get used to the new position, but the morning stiffness I had been living with for years almost completely disappeared."
- Mark T., Geelong
Creating the Right Support System
Good spinal alignment during sleep is about creating the right combination of position and support. A consistent bedtime routine that includes settling into a comfortable position, along with the right pillow height and mattress support, makes a significant difference. Comfortable sleep accessories that suit your sleeping style help complete the picture.
If you have persistent back or neck pain that does not improve with position adjustments, it is worth seeing a physiotherapist or GP who can assess your alignment and recommend targeted solutions.
"My physio recommended sleeping on my back with a pillow under my knees for my disc issues. It felt strange at first but after a few nights I got used to it. Combined with a firmer mattress, my morning pain has reduced dramatically. I wish I had made these changes years ago."
- Sandra K., Hobart
