@article{ref1, title="Variations in sleep schedules", journal="Waking and sleeping", year="1977", author="Naitoh, P. and Johnson, L. Clark and Lubin, A. and Moses, J. M.", volume="1", number="2", pages="133-137", abstract="

[Abstract unavailable]

", language="", issn="0340-0905", doi="", url="http://dx.doi.org/" }