Translation guide
Describes someone who is deeply and soundly asleep, not easily woken. In Japanese, this is commonly expressed with adverbs like ぐっすり or phrases meaning 'sleeping deeply'.
To say someone is sleeping soundly and deeply, not easily disturbed.
An adverb meaning 'soundly' or 'deeply', most commonly used with 寝る (to sleep). It implies a peaceful, deep sleep.
I slept soundly last night.
Literally 'in deep sleep'. A slightly more formal or written way to say someone is fast asleep.
Slang for 'sleeping like a log' or 'dead to the world'. Very casual and expressive.
I was exhausted yesterday and slept like a log.
The baby is fast asleep.
He was fast asleep and didn't notice the earthquake.