Aharder bed may not be better for your back. A recent study in ‘Spine’ found that people who slept on softer beds reported less lower-back pain than those who snoozed on harder ones. Pillows? Yours shouldn’t raise your head out of alignment with your spine. How to tell: If you’re a back sleeper, your chin shouldn’t press into your chest. If you’re a side sleeper, it shouldn’t curve up toward your shoulder.