The leading drug prescribed for male impotence can counteract the lethargy caused by a disruption in the sleep cycle, a study in rodents suggests. Sildenafil, commonly known as Viagra, helps hamsters rebound from a 6-hour clock change such as a long eastbound plane flight produces.
To mimic conditions that can lead to jet lag, scientists habituated hamsters to a daily routine of 14 hours of light and 10 hours of darkness.
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