![]() Nocturnal seizures can also occur when waking or stirring during the night. Seizures don’t seem to happen during REM sleep, but may occur at any other time during the sleep cycle, often in light sleep – that is, stages 1 and 2 of sleep. Sleep is divided into 5 stages: Non-REM Stages 1, 2, 3, and 4 and REM sleep. There are dramatic changes on EEG during these sleep stage changes. and this whole cycle occurs 3-4 times per night.As an example, in wakefulness, our brain waves remain fairly constant, but during sleep there are many changes. It’s believed that nocturnal seizures are triggered by changes in the electrical activity in your brain when moving between the different stages of sleep, and between sleep and awakening stage. Some seizures occur predominantly at a certain stages of sleep. It is thought that a change of state has an effect on the brains ‘epileptic activity’ in people with epilepsy. But during sleep, there are many changes of state, which are called sleep stages. When we go off to sleep, we have a change of state – from awake to asleep. Why do nocturnal seizures occur?Įpileptic seizures are often strongly influenced by the sleep-wake cycle. It is estimated around 12 percent of people with epilepsy have nocturnal seizures. The International League Against Epilepsy (ILAE) defines nocturnal seizures as ‘ seizures occurring exclusively or predominantly (more than 90%) from sleep.’ ![]() People who have only night-time seizures in their sleep are defined as having nocturnal epilepsy. Some people have seizures occurring only during sleep whilst others have both daytime and night-time seizures. Seizures during sleep can occur with any type of epilepsy. Why do so many seizures happen during sleep?
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