Can You Sleep With a Concussion? What the Evidence Actually Says

Someone in your family has just taken a knock to the head. They are tired. They want to sleep. And you remember hearing, maybe from a coach, a first-aider, or something you read years ago, "don't let them sleep."

So you are sitting on the edge of the bed at midnight, waking them every two hours, wondering if you are doing the right thing.

Here is the short answer: in most cases, you can let them sleep. Sleep is not the enemy after a concussion. It is part of how the brain recovers.

Where did the "don't let them sleep" advice come from?

The advice has a legitimate origin. Before CT scans were widely available in emergency departments, one of the only ways to detect a serious brain bleed was to monitor a person's level of consciousness over time. If they became harder to rouse, that was a sign something dangerous was happening.

Waking someone every two hours was a safety check, not a treatment. The goal was to catch a rare but serious complication early. The advice was never really about sleep being harmful. It was about not missing the warning signs of a brain haemorrhage.

Over time, the rationale was lost and the instruction remained. Most people today still believe sleep after concussion is dangerous. It is not, as long as the person does not have red flags requiring emergency care.

What sleep actually does after a concussion

Sleep is when the brain does much of its repair work. During deep sleep, the glymphatic system clears metabolic waste from brain tissue, including the kind that accumulates after injury. Growth hormone is released. Memory consolidation happens. Neurological recovery depends on adequate sleep.

Sleep deprivation, on the other hand, worsens many concussion symptoms. Headache, brain fog, irritability, and difficulty concentrating are all made worse by a poor night's sleep. Keeping someone awake as a precaution can slow recovery rather than support it.

Modern concussion guidelines from bodies including the Australian Institute of Sport support early, graduated return to normal activity, including normal sleep. Rest is a recognised part of early recovery.

Should you wake someone after a concussion?

This is where some nuance matters. The answer depends on the first few hours after injury, not the whole night.

If the person has been assessed and has no red flags, there is no clinical reason to wake them repeatedly through the night. Let them sleep.

If the injury happened very recently and the person has not been medically assessed, it is reasonable to check on them once or twice in the first two to three hours. Not to prevent sleep, but to confirm they can be roused and seem like themselves. A brief rouse is enough. You are checking they respond normally, not keeping them awake.

If you are unsure whether they have been properly assessed, or anything about them seems off, the right call is emergency care rather than monitoring at home.

Red flags: go to emergency, not bed

Before sleep becomes a question, some situations need immediate attention. Go straight to emergency or call 000 if you see:

• Loss of consciousness after the injury
• Seizure or convulsion
• Headache that keeps worsening rapidly
• Repeated vomiting (not just once)
• One pupil larger than the other
• Increasing confusion or unusual behaviour
• Weakness or numbness in the arms or legs
• Slurred speech
• Inability to be woken

These are signs of a potentially serious brain injury, not a concussion to manage at home. The Healthdirect concussion page lists red flags clearly. If in doubt, seek emergency care first. We are a day clinic in Subiaco, not a 24-hour emergency service.

How to support good sleep after a concussion

Sleep quality matters as much as sleep quantity during concussion recovery. A few things that help:

• Keep the room cool, quiet, and dark. Light and noise sensitivity are common early symptoms
• Avoid screens in the hour before sleep (phones, tablets, and television worsen light sensitivity and delay sleep onset)
• Maintain consistent sleep and wake times where possible
• Avoid alcohol completely. It disrupts sleep architecture and slows brain recovery
• Paracetamol can help with headache comfort if needed; avoid ibuprofen and aspirin in the first 24 hours

If sleep problems persist beyond the first week such as difficulty falling asleep, frequent waking, or excessive daytime fatigue, raise this at your concussion assessment. Sleep disturbance is a recognised concussion symptom and part of what we assess and manage.

When to see a concussion physiotherapist

A structured assessment within the first week makes a genuine difference. We look at the full picture: symptom pattern, vestibular and visual function, cervical spine involvement, and a safe return-to-activity plan you can actually follow.

At Heads Up Concussion Care in Subiaco we see concussion patients every week; sport-related, workplace, and everyday head knocks. Initial appointments are in person or via telehealth. No referral is required. Book an appointment online or call 0401 498 498.

For a broader look at the injury itself, visit what is a concussion, or read what to expect in the first 48 hours if you are still in the early days after a head knock.