TY - JOUR T1 - On the Nature of Sleep JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 123 SP - 73 EP - 87 PY - 1833/01/01/ UR - http://dx.doi.org/10.1098/rstl.1833.0009 M3 - doi:10.1098/rstl.1833.0009 AU - Philip, A. ER -