This experiment was performed to investigate whether the combined-preparation of crude drugs (The $Well^{TM}$ Preparation, TW), has hypnotic effects and/or enhances pentobarbital-induced sleep behaviors. TW was mixed with water extracts of Ginseng Radix red, Germinated brown rice, cultured mountain ginseng, and 50% ethanol extracts of Longanae Arillus, Nelumbinis Folium and Chrysanthemi Flos. TW (100 mg/kg, p.o.) reduced sleep onset and prolonged sleep time induced by pentobarbital similar to muscimol (0.2 ${mu}M$), a $GABA_A$ receptor agonist. Also, TW (2 ${mu}g$/ml) and pentobarbital (2.5 ${mu}M$) did not affect the chloride influx in primary cultured cerebellar granule cells, respectively, but the combined-treatment of TW (2 ${mu}g$/ml) and pentobarbital (2.5 ${mu}M$) increased the chloride influx onto the cells. In conclusion, TW augments pentobarbital-induced sleep behaviors; these effects may result from chloride channel activation.