The headache ends. The migraine doesn't. Postdrome is real.

The day you 'should be fine'

You took the rescue medication. The headache eased. You went to sleep. You woke up the next morning, the pain is gone, and you are not fine.

You can't hold a thought past thirty seconds. The screen burns your eyes through closed lids. You can't remember the meeting you scheduled for ten. Plain rice is the only thing that sounds edible. The person you were two days ago, the parent, the partner, the coworker, hasn't come back yet.

This is the morning your manager said you'd be fine. The morning the school nurse called and asked if you could come back to work. The morning you told yourself, again, that the migraine was over.

It isn't over. The headache phase is over. The migraine isn't.

The phase has a name and a literature

It's called postdrome. It's the fourth phase of the migraine cycle, and the research on it is small but unambiguous.

Bose and Goadsby's 2016 electronic-diary study, published in Neurology, tracked 120 patients across more than two thousand attacks. 81% reported postdrome symptoms. The phase lasted, on average, 25.2 hours. The eight most common symptoms were: tired or weary, difficulty concentrating, weakness, dizziness, neck stiffness, sensitivity to light, sensitivity to sound, mood changes.

A 2018 follow-up established that postdrome occurs in both spontaneous and triggered attacks, and that for some patients the disability in the postdrome phase is greater than in the headache itself.

The literature is clear. Clinical practice and consumer migraine apps have not caught up. Most trackers don't model postdrome at all, which means the phase that disables you for 25 hours after the headache ends doesn't appear in the data your neurologist sees.

Why 'just rest it off' is the wrong advice

The reflexive advice for the day after a migraine is hangover advice: rest, hydrate, push through. The mechanisms aren't the same.

Researchers think postdrome involves the decay of a CGRP cascade, the aftermath of cortical spreading depression, and the slow normalization of neurotransmitter levels disrupted by the attack. None of those processes accelerate when you drink water or take a nap. Rest helps you not crash a car; it doesn't shorten the brain-fog window.

The practical consequence: the day after a bad migraine is not a recovery day in any useful sense. It's a different kind of disability day, and treating it like a hangover sets you up to schedule work that you can't do, then blame yourself when you can't do it.

Three things you can do with this information

Track the postdrome phase separately from the attack. The intervention here is data, not action. You can't manage what you don't measure, and your insurance, your employer, and your neurologist all need data they can verify. A tracker that lumps the postdrome hours into the attack hours, or worse, ends the record at the headache, is throwing away the evidence of your worst day.

Don't schedule recovery work in the postdrome window. If postdrome typically lasts 24-30 hours for you, the meetings and chores you planned for "the day after" should respect that. Move what you can. The first time you do this honestly, the rest of your week will tell you whether you got it right.

Look at what predicts your postdrome. Most postdromes are predictable from a small set of factors: cycle phase, sleep the night before, intensity of the attack, which rescue medication you used. Once you have a few months of data, the predictability becomes scheduling power. You can stop being surprised by the phase that has surprised you for years.

Why we named our app after this phase

We built Postdrome because the day after the migraine is the part nobody, your doctor, your employer, your partner, the App Store category, takes as seriously as the headache itself.

We named the brand after the phase because the data model is built around it. Symptoms log as a continuous timeline, with the postdrome window first-class, not an afterthought. The auto-detected postdrome flag in the app is what the literature describes: the 24-hour window of fatigue, brain fog, photophobia, and mood disruption that follows the attack and disables your week.

If you've been told for years that you should be fine the day after, and you've spent those years quietly knowing you're not, the phase has a name. The literature is on your side. And the tracker is built around that fact.