ぐっすり

adverb, adverb taking the 'to' particle

soundly; fast asleep

Describes sleeping deeply and peacefully. Often used with verbs like 寝る or 眠る.

• 昨さく夜やはぐっすり眠ねむれた。

  I slept soundly last night.

• 赤あかちゃんがぐっすり寝