You need a very thin, flat pillow (or no pillow at all) to prevent straining your upper back. 2. Choose Your Material

The goal is to keep your spine parallel to the ground or perpendicular to gravity.

After spending way too many hours scrolling through r/Bedding, r/Mattress, and r/LifeProTips, I’ve realized that most people (myself included) are sleeping on the absolute wrong setup. Buying a pillow isn't just about "soft" vs. "firm"—it’s about spinal alignment. If your head cricks up, it's too high; if it angles down, it's too low.

Top Pick: The Pillow Cube Sidekick is a Reddit favorite specifically for side sleepers.

Here is the ultimate Reddit-inspired breakdown for finding your "Endgame" pillow.