. Author manuscript; available in PMC: 2010 Jul 8.

Published in final edited form as: Curr Biol. 2008 Aug 5;18(15):R670–R679. doi: 10.1016/j.cub.2008.06.033

Table 1.

Model organisms and sleep traits.

	Caenorhabditis elegans (nematode)	Drosophila melanogaster (fruit fly)	Danio rerio (zebrafish)
Posture	?	Prone, supported	“drooping” fin
Reduced activity	+	+	+
Arousal threshold	+	+	+
Homeostasis	+	+	+¹

Exception during constant light.