@article{ref1,
title="The cost of sleepiness",
journal="Sleep",
year="1995",
author="Leger, D.",
volume="18",
number="4",
pages="281-284",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0161-8105",
doi="",
url="http://dx.doi.org/"
}