Gooneratne, N.S., Gehrman, P., Curubhagavatula, I., Al-Shehabi, E., Marie, E. and Schwab, R. (2010) Effectiveness of ramelteon for insomnia symptoms in older adults with obstructive sleep apnea: A randomized placebo-controlled pilot study. Journal of Clinical Sleep Medicine, 6, 572-580.