Wakefulness, non-rapid-eye-movement sleep (NREMS), rapid-eye-movement sleep (REMS), slow-wave activity of the electroencephalogram (SWA), body temperature and locomotor activity in ghrelin receptor wild-type (WT) and knockout mice (KO).

<p>Open symbols: vehicle injection, solid symbols: 7.5 mg/kg C75 intraperitoneally (ip). Data were calculated in 2-h time blocks. Time “0”: time of the injections. Activity is expressed as the percent of the total 24-h activity on the vehicle day. Dark shaded areas: dark period. Error bars: standard error. Asterisks denote significant differences between control and treatment days (<i>post hoc</i> paired t-test).