Sleep is the foundation of physical and mental health. It affects everything from immune function to mood regulation to decision-making. If you're a vaper, you've probably wondered: is my habit affecting how well I sleep? The short answer is yes — primarily because of nicotine.

But the full picture is more nuanced. When you vape matters more than you might think. What strength you use matters. Whether you use salt nic or freebase matters. And even flavorings might play a small role.

In this guide, we break down the science of how vaping affects sleep. We draw on nicotine pharmacology research, sleep laboratory studies, population surveys, and emerging vape-specific research. We rate every claim by evidence strength and highlight what we still don't know.