Optogenetic activation (using Cnoc\ChR1::Csub\ChRCsChrimson.IVS.20xUAS.Venus with 617 nm (red) light) of Scer\GAL4GMR27B03 cells in adults during the day does not significantly affect daytime sleep, similar to controls, but there is significantly increased nighttime sleep following this activation, unlike controls; activation has no effect on daytime or nighttime sleep bout duration or number, compared to baseline.