MelatoninSalivaReceptors, MelatoninReceptor, Melatonin, MT1Receptor, Melatonin, MT2Pineal GlandSaliva, ArtificialCircadian RhythmSalivary Proteins and PeptidesArylalkylamine N-AcetyltransferaseAcetylserotonin O-MethyltransferaseTryptaminesPhotoperiodSalivationParotid GlandLightKynuramineAntioxidantsSalivary GlandsSubmandibular GlandSleepSleep Disorders, Circadian RhythmMouthSublingual GlandImmunoglobulin A, SecretoryXerostomia5-MethoxytryptamineDrug ImplantsSeasonsStreptococcus mutansChronobiology DisordersRats, Wistar