The EEG/EMG signals were amplified and filtered (EEG: 0.5-64 Hz, EMG: 16-64 Hz), then digitised at a sampling rate of 128 Hz, and recorded using SLEEPSIGN software (Kissei Comtec, Nagano, Japan). In addition, locomotor activity was recorded with an infrared photocell sensor (Biotex, Kyoto, Japan). Reference: Oishi Y, Takata Y, Taguchi Y, Kohtoh S, Urade Y, Lazarus M. Polygraphic recording procedure for measuring sleep in mice. J Vis Exp. 2016, 107:e53678, doi: 10.3791/53678. PubMed PMID: 26863349. * Dataset 1: KM20150417_EEG5_7_8.kcd and KM20150417_EEG5_7_8.edf Baseline polygraphic recording commenced at 17:00 on April 17, 2015 and terminated at 17:00 on April 19, 2015. Recordings for animal 1 (EEG/EMG/LOC5), 3 (EEG/EMG/LOC7) and 4 (EEG/EMG/LOC 8) are included in the analysis. Recordings are provided in the proprietary Kissei Comtec Data format (.kcd) and the open European Data Format (.edf). * Dataset 2: KM20150420_EEG5_7_8.kcd, KM20150420_EEG5_7_8-1.edf and KM20150420_EEG5_7_8-2.edf A wire-mesh-grid cage bottom (purchased from Oriental Yeast Company, Tokyo, Japan) was introduced, at 16:30 on April 20, 2015. Polygraphic recording commenced at 17:00 on April 20, 2015 and terminated at 17:00 on April 24, 2015. Recordings for animal 1 (EEG/EMG/LOC5), 3 (EEG/EMG/LOC7) and 4 (EEG/EMG/LOC 8) are included in the analysis. Recordings are provided in the proprietary Kissei Comtec Data format (.kcd) and the open European Data Format (.edf). Due to a capture-stop/restart event at 11:04:10 on April 22, 2015 during recording by the SLEEPSIGN software, the KCD data were exported in two separate EDF files: - KM20150420_EEG5_7_8-1.edf: 4/20/2015 17:00:00 to 4/22/2015 11:04:00 - KM20150420_EEG5_7_8-2.edf: 4/22/2015 11:04:20 to 4/24/2015 17:01:20