gussuri
A deep, uninterrupted sleep where nothing can wake you. The best kind of rest after a long day.
💡After a tiring hike — 'I slept gussuri for ten hours straight last night.'
昨夜はぐっすり眠れた。
I slept gussuri last night.
I was so tired that I slept ___ for twelve hours.
疲れていたから、12時間○○眠った。