circadian, inherent, diurnal, endogenous, intrinsic, cardiac, normal, respiratory, daily, spontaneous, biological, circannual, automatic, basic, electrical, behavioral, tidal, ultradian, persistent, hour, low, overt, significant, seasonal, orcadian, regular, abnormal, clear, adrenal, maternal, slow, annual, cortical, relative, like, apparent, cellular, lunar, running, nyctohemeral, robust, characteristic, dependent, weak, intrathalamic, solar, physiological, pineal, thalamic, autogenic, innate, physiologic, marked, adrenocortical, sinus, myocardial, diel, recordable, observed, biologic, dreadful, mammalian, disturbed, vesical, intestinal, arcadian, fastest, nocturnal, nodal, behavioural, thalamocortical, glacial, autonomous, reproductive, expiratory, sleep, circatidal