The hidden way cannabis changes your brain while you sleep - The Washington Post

What the report says

The Washington Post reported on research indicating that cannabis may alter sleep by suppressing rapid eye movement, or REM, the sleep stage most closely associated with vivid dreaming. The article frames the effect as a largely hidden way cannabis can change brain activity overnight, with potential implications for how scientists understand memory, emotional processing and the role dreams play in mental life.

According to the Post’s summary, the central issue is not only whether cannabis helps some people fall asleep, but what kind of sleep follows. REM sleep is a normal part of the sleep cycle, and researchers have long studied its links to learning, mood regulation and the processing of experiences. If cannabis reduces REM activity, that could help explain why some users report fewer dreams, altered dream recall or changes after stopping use, though the available snippet does not provide study details, sample sizes or clinical recommendations.

The report matters because cannabis is increasingly used for relaxation, pain, anxiety and sleep, while many consumers may focus on short-term sedation rather than sleep architecture. General sleep science distinguishes between feeling sleepy and getting restorative, balanced sleep across multiple stages. Any substance that shifts those stages can raise questions beyond total hours slept.

The Post’s article appears to place cannabis and REM sleep within a broader scientific debate about what dreams do and how nightly brain activity supports daytime functioning. Based on the available text, it does not establish a single outcome for all users, and effects may vary by dose, frequency, product type, individual biology and withdrawal patterns. Readers considering cannabis for sleep should treat the research as a prompt for informed discussion with health professionals, especially if they have sleep disorders, mental health concerns or use other medications.