Festival or concert with epilepsy: strobe light, alcohol and sleep loss
Festival or concert with epilepsy: how common photosensitivity is, what a strobe-light study shows, and how to record the night.
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You have a ticket for a festival or a concert. You want to know what epilepsy means for the lights, the crowd and the late night. You can record the night before and after on paper or in the epilepsy program in Sam, a diary with a doctor report. A seizure you enter on the day sits next to your sleep from Apple Health, when a value exists.
Strobe light, alcohol and sleep loss can be triggers for some people. Only a minority of people with epilepsy are photosensitive: about 3 to 5 in every 100, says Epilepsy Action. An EEG with flashing light usually shows whether you are one of them. Whether and how you go is a decision for you and your treatment team.
Who is photosensitive, really?
Photosensitive epilepsy is the minority. Epilepsy Action says about 3 to 5 in every 100 people with epilepsy have seizures caused by visual triggers. Most cases start in people under 20, and photosensitive epilepsy affects about 1 in 4000 people overall. The US Epilepsy Foundation gives a similar share, around 3 percent of people with epilepsy.
So most people with epilepsy are not photosensitive. Some are. Whether that is you usually shows in an EEG. During the test, doctors use a light that flashes and watch how your brain responds. Ask your neurologist whether an EEG with flashing light was done and what it showed.
What kind of light can trigger a seizure?
Epilepsy Action says a light is more likely to trigger a seizure if it is very bright, fills at least 10 percent of your visual field, lasts at least half a second and reaches both eyes. Flash rate matters too. A rate between 10 and 25 flashes per second is most likely to cause a seizure, but some people are sensitive from 3 up to 60 per second.
Strobe lighting at concerts and in clubs is on the list, along with rapid camera flashes, flickering bulbs and some Christmas lights and fireworks.
What does the festival study actually show?
One large study looked at electronic dance music festivals in the Netherlands. Salet and colleagues analysed 28 festivals from 2015 with 400,343 visitors, all using strobe effects, and compared events in the dark with events in daylight. In total, 39 seizure episodes were registered, 30 at night events and 9 at daylight events. The rate in the dark was about 3.5 times higher (95% confidence interval 1.7 to 7.8). The authors conclude that strobe effects in the dark probably more than triple the risk.
The authors are careful about what this means. Light, sleep loss, heavy movement and some stimulants could not be fully separated. They call the light a prime suspect, but probably not the only cause. Seizures were recorded by on-site medical staff from witness reports and physical signs, not from EEGs.
So the numbers are an observation about a group, not a verdict about your risk. The authors suggest that people with photosensitive epilepsy either skip such festivals or take precautions: tell friends, avoid sleep deprivation and stimulants, stand far from the stage, and move away from the light quickly if they feel an unusual sensation. That is a proposal from the authors, not a guideline.
Why do sleep loss and alcohol belong on the list too?
Seizure triggers are personal, and triggers often combine. A festival night brings sleep loss and often alcohol together. Epilepsy Action says alcohol can be a seizure trigger for some people, and that it disrupts sleep, which can add risk. Missing a medicine dose is another common trigger, and a long, loud night is easy to forget one.
Whether and how much you drink is not a question for a blog post. It belongs with your treatment team. If you want to record an evening honestly, see alcohol and epilepsy: what to record. On sleep as a trigger, the epilepsy hub in Sam holds more, and so does sleep and epilepsy: your triggers in view.
What if a strobe starts with no warning?
Epilepsy Action gives a simple move for a possible trigger that appears without warning: cover one eye with your hand and turn away or leave the area. Do not close your eyes, because that can create a flicker effect. Light is more likely to trigger a seizure if it reaches both eyes, which is why covering one can help. The Epilepsy Foundation gives the same advice: cover one eye and turn away from the source.
Concerts sometimes warn about strobe lighting, but not always, Epilepsy Action says. It can help to ask the venue before the show.
Seizure first aid: what do friends need to know?
Your friends do not need medical skills. They need a few simple rules. The CDC says most seizures do not need emergency care. Call the emergency number if a seizure lasts longer than 5 minutes, another one follows quickly, the person has trouble breathing or waking, is injured, the seizure happens in water, or it is the person's first seizure. Use your local emergency number (112 in the EU, 999 in the UK, 911 in the US).
Time the seizure so you know if it passes 5 minutes. Keep the person safe, turn them on their side, clear the space around them, and do not put anything in their mouth. People near you will find more in living with epilepsy.
What do I record the night before and after?
A short record shows your neurologist what happened around the event. A few rows cover the useful ground:
| When | What to record |
|---|---|
| Before | Type of event, and whether it was indoors in the dark or outdoors in daylight |
| Before | Sleep in the two nights before, with bed and wake times |
| Before | Whether you took your medicine that day, and at what time |
| During | Where you stood, and whether you noticed strobe light |
| During | Drinks by kind and amount, as you count them |
| After | Sleep in the following night, and medicine the next morning |
| After | Any twitching, aura or seizure, with time and who was there |
Bring the record to your next appointment and do not read into it yourself. One event explains nothing. If something repeats across events, your treatment team can place it. To tell whether a collapse was a seizure or a faint, see seizure or fainting: what is the difference.
Ask your neurologist before the event
These questions work best a few weeks before the event:
- Do I have a form of epilepsy where flashing light plays a role?
- Is an EEG with light stimulation useful for me?
- How do we handle alcohol with my medicine?
- What counts as too little sleep for me?
- What should my friends do, and when do they call for help?
Record the night before and after in Sam and bring the week to your appointment
You bring a record of the weekend instead of a memory of it. The epilepsy program is a diary with a doctor report for that.
- Instead of paper: a seizure you enter on the day sits next to your sleep from Apple Health, and you pick suspected triggers like sleep loss, alcohol or flashing lights.
- Instead of memory: the doctor report as a PDF covers the period you choose.
- Instead of loose notes: discomfort after the event goes in the symptom diary.
Sam records what you enter and does not judge lights or your seizures.
Try Sam HealthSam is a wellness companion, not a medical device. The app does not diagnose, treat, cure or prevent any condition or health state. Always consult qualified professionals for medical decisions.
Related reading
- Alcohol and epilepsy: what to record
- Seizure or fainting: what is the difference
- Sleep and epilepsy: your triggers in view
- Flying with epilepsy: preparation and medication
- Sleep-Deprived EEG: How to Prepare and What to Ask
Sources
Updated: October 2026
- Epilepsy Action: Photosensitive epilepsy (published July 2025, last modified January 2026)
- Epilepsy Foundation: Photosensitivity and seizures
- Salet N, Visser M, Stam C, Smulders YM: Stroboscopic light effects during electronic dance music festivals and photosensitive epilepsy. BMJ Open 2019;9:e023442
- CDC: First aid for seizures (last reviewed 15 May 2024)
More on Epilepsy
Frequently Asked Questions
Can strobe light at a festival trigger a seizure?+
For a small share of people with epilepsy, yes. Epilepsy Action calls strobe lighting at concerts and in clubs a possible trigger for photosensitive epilepsy. Whether that applies to you usually shows in an EEG with flashing light.
How many people with epilepsy are photosensitive?+
Epilepsy Action says about 3 to 5 in every 100 people with epilepsy have seizures caused by visual triggers. Most cases start in people under 20. The US Epilepsy Foundation gives a similar figure, around 3 percent.
What did the festival study from the Netherlands find?+
Across 28 events with 400,343 visitors, the rate of seizures in the dark was about 3.5 times higher than at daylight events. The authors say light, sleep loss, movement and some drugs could not be fully separated, and call the light a prime suspect rather than the only cause.
Do I have to skip parties because of epilepsy?+
That is a question for your treatment team. Photosensitivity is not the same for everyone, and not every event uses strobe light. Ask the venue about lighting before you go, and decide together with the people who treat your epilepsy.
What do I do if strobe light starts suddenly?+
Epilepsy Action says cover one eye with your hand and turn away or leave. Do not close your eyes, because that can create a flicker effect. Light is more likely to trigger a seizure if it reaches both eyes, which is why covering one can help.
When should a seizure at a concert mean calling for help?+
The CDC says to call the emergency number if a seizure lasts longer than 5 minutes, another follows soon, the person has trouble breathing or waking, is injured, or the seizure happens in water. Use your local emergency number (112 in the EU, 999 in the UK, 911 in the US).
How do I find out if I am photosensitive?+
An EEG with a flashing light shows how your brain responds to flicker. Your neurologist can tell you whether one was done and what it showed.