[Epilepsy and sleep].

The relationship between sleep and epilepsy is known from more than a century ago. At the end of the XIXth century a temporal relationship between the onset of epileptic seizures and the wake-sleep cycle was observed. The introduction of the electroencephalogram allowed establishing the effect of sleep and sleeping deprivation on epileptiform interictal discharges and on epileptic seizures. The recognition of the variety of generalized and partial epileptic syndromes associated to sleep is important to make a correct differential diagnosis of patients presenting with motor and behavioural disturbances of sleep. This article reviews the different aspects of the relationship between epilepsy and sleep.