Translation guide
To sleep very deeply and soundly, without waking easily.
Describing a state of deep, undisturbed sleep.
The most common and natural way to say 'sleep soundly/deeply'. 'ぐっすり' is an onomatopoeia for sleeping well.
昨夜はぐっすり眠れた。
I slept like a log last night.
ぐっすり眠って、疲れが取れた。
I slept like a log and recovered from my fatigue.
A slightly more formal or written way to say 'sleep deeply'. Literally 'deep sleep'.
彼は熟睡していて、地震に気づかなかった。
He was sleeping like a log and didn't notice the earthquake.
Slang for 'sleeping like a log', literally 'explosive sleep'. Very casual, often used among younger people.
昨日は爆睡して、遅刻しそうになった。
I slept like a log yesterday and almost overslept.