Sleep and Migraine: The Mechanism Behind the Trigger

"Bad sleep gave me a migraine" is one of the most consistent things people with migraine report, and it's not just a correlation — there's real mechanistic research behind why.

The cortical spreading depolarization link

Migraine aura is thought to be the clinical expression of cortical spreading depolarization (CSD), a wave of neuronal and glial activity that moves across the brain's cortex. A 2020 study in The Journal of Headache and Pain found that acute sleep deprivation specifically lowers the threshold for CSD in animal models — meaning a sleep-deprived brain is measurably more prone to the exact process underlying a migraine attack. Notably, the effect was seen with acute sleep loss, not chronic sleep restriction, which may be part of why a single bad night can trigger an attack the next day even in someone who's generally an adequate sleeper.

What's likely happening chemically