Why Do Rolandic Epilepsy Seizures Happen During Sleep?

Sleep—especially the deeper stages of sleep—profoundly changes how the brain’s electrical networks communicate. In children with Self-limited epilepsy with centrotemporal spikes (SeLECTS, formerly called Rolandic epilepsy), these natural sleep transitions often activate the electrical patterns associated with the condition. This is why seizures commonly occur at night or early in the morning.

Understanding the connection between sleep and SeLECTS can help you feel more prepared and better interpret your child’s test results.

What We Know: NREM Sleep and Centrotemporal Spikes

Sleep is composed of different cycles, primarily alternating between REM (rapid eye movement) and NREM (non-rapid eye movement) stages. As your child drifts off into NREM sleep, their brain waves naturally become highly synchronized and rhythmic.

For a child with SeLECTS, this normal increase in electrical coordination is associated with a sharp increase in centrotemporal spikes ^[1][2].

Important distinction: A spike is not a seizure.
A centrotemporal spike is a brief, abnormal electrical pattern seen on an EEG (a test that measures brain waves). Most of these spikes happen completely silently, causing no physical symptoms or outward signs. However, because NREM sleep facilitates so much of this electrical activity, the chances of these spikes culminating in a physical seizure are higher during these sleep stages ^[3].

The “centrotemporal” or “Rolandic” area is a sensorimotor region of the brain. Because the electrical discharges originate here, the resulting seizures often involve the face, mouth, or throat. This location simply reflects where the temporary electrical vulnerability is during childhood development; it does not mean this part of the brain is damaged.

What Researchers Are Studying

While we know that NREM sleep activates these spikes, the exact biological reason is not fully understood. Researchers are currently studying a few proposed explanations:

• Sleep Spindles: During NREM sleep, the brain produces normal bursts of activity called sleep spindles, which are thought to help filter sensory input and support memory. Some researchers hypothesize that sleep spindles and epileptic spikes might use the same overlapping brain circuits (the thalamocortical network). A few studies have observed an inverse relationship: when normal sleep spindle activity is lower, epileptic spike activity tends to increase ^[4][5].
• Network Excitability: Researchers are also exploring how the increased synchrony of NREM sleep changes brain connectivity. They theorize that the synchronized state of sleep might temporarily alter network excitability, allowing a localized electrical discharge to more easily recruit other brain areas ^[6][7].

Why Seizures Often Happen When Falling Asleep or Waking Up

Parents frequently notice that seizures happen shortly after their child falls asleep or right before waking up in the morning ^[8][9]. These periods of the night are rich in transitions between wakefulness and NREM sleep stages.

While these transitions are the most common times for SeLECTS seizures, it is important to know that they can happen at any point during sleep, and occasionally even when the child is completely awake ^[10][9].

Practical Guidance for Parents

1. Sleep EEGs are highly valuable
Because spikes increase dramatically during sleep, your child’s neurologist will often try to capture at least some sleep during an EEG ^[3]. An awake EEG might look completely normal, but the sleep portion can reveal the hallmark centrotemporal spikes needed for an accurate diagnosis.

2. Monitor for changes in learning or behavior
In some children, a very high frequency of spikes during sleep (often referred to as a high spike burden) is associated with changes in learning, language, or behavior ^[11]. If you notice a loss of skills, new language difficulties, or significant behavioral changes in your child, inform your neurologist promptly.

3. Do not restrict sleep
Because sleep is a trigger, parents are sometimes tempted to keep their child awake or alter their sleep schedule to prevent a seizure. Do not do this. Sleep deprivation is a powerful trigger for seizures. Your child’s developing brain needs consistent, healthy, restorative sleep.

First Aid for Nighttime Seizures

If your child has a seizure during the night, knowing what to do can help keep them safe:

• Time the seizure from start to finish.
• Remove hazards (like sharp bedside tables) and protect their head with a soft pillow or blanket.
• Do not restrain them or put anything in their mouth.
• Roll them on their side once the active movements stop to keep their airway clear and allow saliva to drain.
• Follow your prescribed rescue plan if you have been given rescue medication.
• Seek emergency help according to local guidance (e.g., calling 911) if the seizure lasts 5 minutes or longer, if they have repeated seizures without waking up in between, if they have trouble breathing, if they are seriously injured, or based on the specific emergency instructions provided by your neurologist.