The expression of Hsap\NRXN1^{WT.UAS.Tag:FLAG} under the control of Scer\GAL4^elav.PU, Scer\GAL4^tim.PE or Scer\GAL4^P2.4.Pdf leads to circadian defects: Scer\GAL4^tim.PE-driven expression leads to increased increased evening activity, circadian period and decreased rhythmicity, as well as more but shorter total sleep bouts, decreased day-time sleep, with more but shorter sleep bouts, and fewer night-time sleep bouts; Scer\GAL4^tim.PE-driven expression leads to increased evening activity, as well as fewer but longer total sleep bouts, increased day-time sleep, with more sleep bouts, and fewer but longer night-time sleep; Scer\GAL4^P2.4.Pdf-driven expression leads to increased evening activity and decreased morning index, as well as more total sleep bouts, and more but shorter day-time sleep bouts.