What's the best sleep position for heart health?

Sleeping on the left side reduces the frequency and severity of acid reflux (which can cause nocturnal arrhythmias), improves lymphatic drainage, and in men with heart failure slightly reduces cardiac workload, but for healthy men without heart failure, there is insufficient evidence to recommend one sleep position over another purely on cardiovascular grounds (Levendowski et al., J Clin Sleep Med, 2014).

The sleep position question matters most for men with obstructive sleep apnea, a significant proportion of men with positional sleep apnea (defined as apneas that are 2× more frequent in the supine/back position) see dramatic improvement from side sleeping alone. Before investing in positional therapy devices, a sleep study that records position-dependent apnea-hypopnea index data will confirm whether you are a positional responder. If you are, a simple positional shirt or foam wedge may eliminate the need for CPAP or significantly reduce the severity of required therapy.

Honesty Scale: Positional therapy for positional OSA, Solid (1). Specific cardiovascular benefit of left-side sleeping in healthy men, Theoretical (4).

What to do: If you do not have diagnosed sleep apnea and are interested in sleep position, the priority should be whatever position maintains airway patency and does not cause shoulder or neck pain. Side sleeping reduces supine apneas in most men and is a reasonable default.

For the full picture, read The Sleep Architecture Deep Dive