It never sleeps. It has to keep moving because if it stopped, its magma body would cool and harden.
Base Exp. 0
Height 0.7m
Weight 35kg
#218 - Slugma
Fire
Stats
HP 40 / 255
Attack 40 / 181
Defense 40 / 230
Sp. Atk. 70 / 173
Sp. Def. 40 / 230
Speed 20 / 200