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Mean (± SEM) latency to the first 6 continuous epochs of sleep following drug administration. Latency to sleep onset was both significantly shorter than vehicle and longer than zolpidem (ZOL) following all doses of MDL and RO8554. Latency to sleep onset was shorter following ZOL, compared with all other conditions. *Different from vehicle P < 0.05; †Different from ZOL P < 0.05.
