by Quick answer: There's no single best side for everyone. Side sleeping suits many people and supports spinal alignment, and the left side is often suggested for reflux and during pregnancy. Comfort and alignment matter most — see a doctor for medical conditions.
By the MattressNut editorial team · Updated June 2026
Best Sleep Position — The Short Answer
The right position depends on your body and any health issues. Side sleeping is popular and can help keep the spine aligned, and the left side is commonly suggested for people with reflux or who are pregnant. Back sleeping works well for others. The goal is a neutral spine and comfort, not a single rule for everyone.
What to Know
| Factor | Detail |
|---|---|
| Side sleeping | Common and supportive of spinal alignment; a pillow between the knees can help. |
| Left side | Often suggested for reflux and during pregnancy. Ask your doctor about your situation. |
| Back sleeping | Can keep the spine neutral for some, but may not suit everyone, such as heavy snorers. |
Practical Tips
If you sleep on your side, a pillow between your knees keeps your hips aligned and eases lower-back strain. Back sleepers can place a pillow under the knees. Use a pillow height that keeps your head level with your spine. If a position causes pain, numbness, or breathing issues, see a doctor for medical conditions like reflux or pregnancy.
The Mattress Angle
Your position only works if the mattress supports it. Side sleepers usually need a surface that cushions the shoulder and hip while keeping the spine straight, while back sleepers want firmer support. A mattress with the right firmness for your position makes a real difference. Saatva's Classic comes in multiple firmness levels to match how you sleep.
See the Saatva Classic and its 365-night trial
The Bottom Line
The best side to sleep on is the one that keeps your spine neutral and lets you sleep comfortably, with the left side often suggested for reflux and pregnancy. Match your mattress and pillows to your position, and see a doctor for medical conditions like reflux or pregnancy.
Bottom line: Side sleeping suits many people and the left side is often suggested for reflux or pregnancy, but the best side is the one that keeps you aligned and comfortable.
Related: our full Saatva mattress review.