While there’s no definitive answer, some studies suggest that sleeping on your left side might not be ideal for heart health. However, it can benefit those with GERD. Sleeping on your back with a pillow under your knees could alleviate back pain but may worsen sleep apnea symptoms. Ultimately, most experts agree that the best sleep position is the one that allows you to get the most restful and comfortable sleep. Research has shown that poor sleep quality is linked to increased heart disease risk, highlighting the importance of prioritizing sufficient and restful sleep.