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Sleep Med. 2010 Jun;11(6):525-33. doi: 10.1016/j.sleep.2010.03.010. Epub 2010 May 18.

Effects of ramelteon on insomnia symptoms induced by rapid, eastward travel.

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Northwestern University Medical School, Chicago, IL 60611, USA.



Ramelteon, an MT(1)/MT(2) melatonin receptor agonist, was evaluated for its ability to reduce sleep-onset difficulties associated with eastward jet travel.


Healthy adults (n=110) with a history of jet lag sleep disturbances were flown eastward across five time zones from Hawaii to the east coast of the US. Ramelteon 1, 4, or 8 mg or placebo was administered 5 min before bedtime (local time) for four nights. Sleep parameters were measured using polysomnography (PSG) on Nights 2, 3, and 4. Next-day residual effects were assessed using psychomotor and memory function tests.


Compared to placebo, there was a significant decrease in mean latency to persistent sleep (LPS) on Nights 2-4 with ramelteon 1mg (-10.64 min, P=0.030). No consistent significant differences were observed with ramelteon vs. placebo on measures of next-day residual effects except on Day 4 where participants in all ramelteon groups performed significantly worse on the immediate memory recall test compared with placebo (P < or = 0.05). The incidence of adverse events was similar for ramelteon and placebo.


After a 5-h phase advance due to eastward jet travel, ramelteon 1mg taken before bedtime for four nights reduced mean LPS relative to placebo in healthy adults.

[Indexed for MEDLINE]

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