Cannabis, sleep and anxiety

Why do some people sleep better after using cannabis, while others notice little or no difference?

I sometimes see people turn to cannabis to help them sleep better. Some are enthusiastic about it—they sleep more deeply, feel calmer, and function better during the day. Others notice little difference or even feel worse. Why does it work for some but not for others?

First, a quick disclaimer: I believe the best sleep comes without any aids. A solid day-night routine, relaxation, and understanding your own sleep patterns remain the foundation. Still, I’m not fundamentally opposed to using CBD (cannabidiol) as temporary support. When used with proper guidance, I see it as a relatively safe option. However, there isn’t enough scientific evidence yet to broadly recommend it for sleep problems.

CBD, not THC for sleep

And note: I mean specifically CBD, not THC (tetrahydrocannabinol). THC disrupts the natural structure of your sleep and suppresses REM sleep which can actually have negative effects in the long run.

A recent study sheds light on why CBD works better for some than others. It may have to do with your immune system. Researchers found that people with higher baseline inflammation — something common with chronic stress or mental health issues — benefited much more from CBD than those with low inflammation. They slept better and felt calmer.

CBD proved to be the most reliable compound: regardless of inflammation levels, it positively affected sleep and mood. THC showed much more variable effects, especially in people with very low or very high inflammation levels.

These insights help explain why previous studies showed such mixed results. They also highlight that sleep problems aren’t just psychological but can also have a physical component. And that the effects of cannabis can vary greatly from person to person.