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\section*{Abstract}  Mammalian T-type Ca\textsuperscript{2+} channels are encoded by three separate genes (Ca\textsubscript{v}3.1, 3.2, 3.3).  Some reports have implicated these In mammals,  T-type channels as are reported to be  sleep stabilizers that are important in the generation of the delta rhythms of deep sleep, but controversy remains. Progress in identifying the precise  physiological functions of the T-type channels has been hindered by many factors, including possible compensation between the products of these three genes and a lack of specific pharmacological inhibitors. Invertebrates have only one T-type channel gene and its physiological functions are less well-studied.  We cloned DmCa\textsubscript{v}3, the only Ca\textsubscript{v}3 channel gene in the \emph{Drosophila melanogaster} genome, and found that it shows broad expression is broadly expressed  across the adult brain. fly brain in a pattern vaguely reminiscent of mammalian T-type channels.  Voltage-clamp analysis revealed that the biophysical properties of DmCa\textsubscript{v}3 are more similar to Ca\textsubscript{v}3.2 and Ca\textsubscript{v}3.3 than Ca\textsubscript{v}3.1.  Flies lacking DmCa\textsubscript{v}3 show an abnormal increase in sleep duration that is most pronounced during subjective day under continuous dark conditions despite normal oscillations of the circadian clock.  Thus, our study suggests invertebrate T-type Ca\textsuperscript{2+} channels promote wakefulness rather than stabilizing sleep.