There are 2 studies that match your criteria.
Criteria: Freq Range=300 kHz - 300 GHz (RF/mmW/THz),Study Type=Epidemiology,Study Subtype=EEG, Event Related Potentials, Sleep Disturbances,Status=Ongoing

Details - Project ID 1152
Lab	Graz University of Technology, Austria
Study Design	EPROS: RF exposure (from environmental sources) and analysis of sleep distrurbances, EEG and cognitive function (epidemiologic study)
Summary
Citation
Details - Project ID 1984
Lab	University of Berne, Switzerland
Study Design	900, 1800, 2000 MHz (GSM, UMTS) mobile phone use and base station exposure and correlation with sleep disorders
Summary	No correlation between exposure and sleep quality,although there was a trend in heavy users to report daytime sleepiness
Citation