The differential diagnosis of paroxysmal disorders is very broad in children.The present study included 50 infants ranging in age from 5 months to24 months complaining of paroxysmal events. They were subjected to longterm EEG polygraphic study with concomitant video recording using acomplete array EEG in addition to monitoring of additional physiologicalparameters as EOG EMG, EKG, and respiratory assessment. All usingcable telemetry. The study included also recording during spontaneoussleep .The event detection rate was 82 %, 64% of the patients hadepileptic events and 28% had nonepileptic events leaving 8% of thestudied patients undiagnosed.Recording during sleep showed that for the epileptic events this activationof some and suppression of other clinical seizures during certain portionsof the sleep-wake cycle in addition to alterations in distribution ormorphology of epileptiform waveforms, as for the of the non epileptic eventthe many of the recorded events were sleep –related paroxysmal events.