Clinical Trials

Sleep Medicine Associates offers clinical drug and device studies concerning sleep apnea, narcolepsy, insomnia (dysomnia), limb-movement disorders and excessive daytime sleepiness.

Sleep Medicine Associates is committed to using the most effective technology to diagnose and treat sleep disorders and improve patients' overall health and quality of life.

Clinical Trials Investigators

Ralph Pascualy, M.D.

Dr. Pascualy is board-certified in sleep disorders medicine and psychiatry with interests in geriatric medicine and insomnia. Additional research interests include narcolepsy, sleep apnea, excessive daytime sleepiness and limb-movement disorders.

Sarah Stolz, MD

Darius Zoroufy, MD

Preetam Bandla, MD

Ian Merrill, MD

Nigel Ball, Ph.D.

Dr. Nigel Ball is a biologist with specific interests in workplace fatigue and sleep disorders in women. His other research interests include insomnia, excessive daytime sleepiness, arousal influences on sleep disorders and sleepiness.


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Sleep Medicine Associates diagnoses and treats all forms of adult sleep disorders and pediatric sleep disorders including snoring, sleep apnea (sleep disordered breathing), daytime sleepiness and insomnia, narcolepsy, restless legs syndrome, fatigue, shift work, jet lag, sleep walking, circadian rhythm, periodic limb movement disorder; and conducts clinical trials, overnight sleep studies, PAP therapy and consultation at convenient Puget Sound, Western Washington locations, including the largest sleep medicine facility in the Pacific Northwest.

Seattle - Sleep Medicine Center
Seattle-Cherry Hill
550 17th Avenue, Suite A20
Seattle, WA 98122
(206) 386-4744

Issaquah - Sleep Medicine Center
Issaquah
2005 N.W. Sammamish Road
Issaquah, WA 98027
(425) 394-0024

North Seattle - Sleep Medicine Clinic
NW Hospital Campus
1536 North 115th Street, Suite 320
Seattle, WA 98133
(206) 386-4744