What the brain feels when dying is one of the hardest questions to answer, because the person who dies can’t tell us. What we do know, from studies of hospice patients and recordings of brain activity, is that the brain doesn’t shut off all at once: the end is a process, not a switch.
What We Know and What We Don’t: An Honest Caveat
Studying the end of life is difficult for ethical and practical reasons. Patients are often unconscious, studies are small, and above all, no one can report what they experienced after dying. The stories of light or peace we’ve heard come from people who survived a cardiac arrest or a brush with death. That isn’t the same as dying.
So I sort the evidence into three groups: what has been measured, what has been proposed as a hypothesis, and what remains a mystery.
What Has Been Measured: The Brain Doesn’t Shut Off at Once
In 2023, a University of Michigan team recorded brain activity in four comatose patients whose life support was withdrawn. In two of them, gamma waves surged, a fast activity associated with conscious processing, along with a rise in heart rate. The same group had earlier seen something similar in rats for about 30 seconds after cardiac arrest.
What it means is still uncertain. The sample is tiny, other researchers question how the signal was interpreted, and those patients couldn’t tell us whether they experienced anything. What the studies do show is that the end of brain activity isn’t a simple line that fades out.
Is Hearing Really the Last Sense to Go?
A 2020 study in Scientific Reports used EEG to measure how hospice patients in Vancouver responded to sound. When some became unresponsive in their final hours, their brains still reacted to changes in a sequence of tones, much like healthy people’s brains did.
It’s a very small study: the unresponsive recordings come from five people, and the authors say they can’t know whether those patients were aware of what they heard. Still, it leaves a practical, human takeaway: if you’re sitting with someone in their last hours, you can speak to them with love. We don’t know how much they take in, but there are signs that sound registers.
The Light, the Peace, and the Memories: Hypotheses, Not Certainties
Accounts from people who came close to death often include light, calm, a sense of leaving the body, or a replay of memories. A 2025 review in Nature Reviews Neurology proposes a model: low oxygen and rising carbon dioxide disrupt brain activity and trigger a massive release of neurotransmitters. Among them, GABA and endorphins could explain the feeling of calm. It’s a reasonable proposal, not a proven fact.
Another hypothesis is REM intrusion: that under extreme crisis, the brain blends features of REM sleep with wakefulness. I’ve explained how the “switch” that paralyzes the body during REM works in my article on habits that harm the brain and in this one on waking up at 3 AM. Even so, the link between REM intrusion and near-death experiences is still debated among specialists.
There’s also no evidence that everyone has a peaceful experience when they die.
Dying Comfortably: What Medicine Can Do
Dying isn’t always peaceful. It depends on the illness and the circumstances, and there can be pain, anxiety, or trouble breathing. Palliative care exists to relieve those symptoms and to support the person and their family. If you or a loved one is facing advanced illness, it’s worth asking your medical team to include palliative care early.
Caring for Your Brain While You Live
The best lesson from these studies is that the brain keeps working until the end, and that it’s worth caring for every day. Sleep well, since the glymphatic system clears waste overnight, as I explained in my article on the glymphatic system. Nurture relationships that are good for you, as we saw in this article. Keep moving and keep learning.
If you’re worried about your memory or sleep, or want to talk about your neurological health, you can book a visit here.
If you’re grieving or having thoughts of harming yourself, help is available: in the U.S., you can call or text 988.
Frequently Asked Questions
What does the brain feel right before death?
No one can say for certain, because the person who dies can’t tell us. Studies of patients show the brain doesn’t shut off all at once and may show organized activity at the end, but we don’t yet know whether it comes with any experience. Explanations about calm or light are hypotheses.
Is it true there’s a surge of brain activity at death?
In a 2023 study, two of four comatose patients showed a surge of gamma waves after life support was withdrawn. It’s a preliminary finding with very few patients, and other researchers question its interpretation, so it can’t yet be considered a general rule.
Is hearing the last sense to go?
There are signs it might be. In a hospice study, some unresponsive patients still reacted to sounds hours before death. The authors note they can’t know whether the patients were aware of what they heard, but speaking lovingly to someone you care about is a way to be present.
Is dying painful?
There’s no single answer, because it depends on the illness and the circumstances. There can be pain, anxiety, or shortness of breath, and palliative care exists to relieve those symptoms. If you or a family member faces advanced illness, it’s worth asking for palliative care early.
What explains the light at the end of the tunnel?
There’s no proven explanation. One hypothesis is that low oxygen and a surge of neurotransmitters alter visual perception and produce calm; another proposes a blend of REM sleep with wakefulness. Both are still debated among specialists.