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Sleep latency averaged across the first days (METH First 5d and METH First 3d) or the last days (METH Last 5d and METH Last 3d) of methamphetamine self-administration (0.03 mg/kg/infusion, i.v.) as well as across protocol days for the 14 Protocol (A, B), the 5–2 Protocol (C, D) and the 3–4 Protocol (E, F). Data are expressed as Mean ± SEM. Dotted lines represent baseline sleep latency (100%). *p<0.05 compared with baseline.
