@article{ref1,
title="Sleepiness: its measurement and determinants",
journal="Sleep",
year="1982",
author="Roth, T. and Roehrs, T. and Zorick, F.",
volume="5",
number="Suppl 2",
pages="S128-34",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0161-8105",
doi="",
url="http://dx.doi.org/"
}