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Intermittent rhythmic delta activities are electroencephalographic discharges with uniform morphology, at a frequency of 4 Hz or less, containing at least six cycles, lost by eye opening and stimulation. These are called "plus" if concomitant theta or higher frequency rapid activity or spike, sharp wave activity is present. This group has a stronger relationship with epileptiform abnormality. We aimed to discuss the clinical presentations, and nomenclature of intermittent rhythmic delta activities with three case reports.

Excessive daytime sleepiness is a common clinical application of Obstructive Sleep Apnea syndrome and narcolepsy patients. Although both medical conditions can be different in extensive daytime sleepiness features and accompanying symptomatology, distinctive features may be masked in some cases. In our four reported cases, there were obstructive sleep apnea syndrome and narcolepsy type 1 coexistence. We aimed to discuss the possibility of this condition being comorbidity, the possibility of masking the type clinics in their association or the possibility of causing each other's risk factors.

Visual sensitivities include photosensitivity, eye closure sensitivity, fixation off-eye closed and pattern sensitivity. Fixation off-eye closed sensitivity occurs while eye closed and the period lasting for more than 3 s and persisting as long as the eyes remain closed or when fixation was interrupted. In this case report, a 19 years old female patient had a history of a single generalized seizure one year ago. Although there is no more seizure, electroencephalography (EEG) examination like as a status epilepticus at different times. When we examined EEG, we recognized these discharges became when eyes closed and persisted as long as eyes closed. In addition, video recording showed us eyelid myoclonus without absence during eyes closed and discharged on EEG. It is aimed to discuss the fixation-off sensitivity and eyelid myoclonus accompanied by literature with this case report.