@article{ref1,
title="The influence of a 1 h nap on performance overnight",
journal="Ergonomics",
year="1989",
author="Rogers, A. S. and Spencer, M. B. and Stone, B. M. and Nicholson, A. N.",
volume="32",
number="10",
pages="1193-1205",
abstract="The effect on performance overnight of a 1 h nap taken at 0200 h was studied in six young female subjects. The subjects completed three schedules, including one with a nap and two without a nap, during which either a placebo or 300 mg caffeine was ingested at 2315 h. Performance was measured from 1700 h in the evening until 1030 h the next morning. Caffeine improved performance overnight on almost all tasks compared with placebo. The nap had some limited beneficial effect compared with placebo, but most tasks remained impaired.<p /> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}