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спать непробудным сном stresses
gen.	be fast asleep
Gruzovik	be fast asleep
fig.	sleep last sleep
Gruzovik, fig.	sleep one's last sleep
Makarov.	be dead to the world; be fast asleep; be in a deep sleep; be in a heavy sleep; sleep the eternal sleep (о мёртвом)
slang	sleep like a log (Interex)