noun, noun or participle which takes 'suru', intransitive verb
sound sleep; good sleep; quiet sleep
Refers to sleeping peacefully and deeply, without disturbance. Often used in contexts of health, relaxation, or ideal sleeping conditions.
昨夜は久しぶりに安眠できた。
Last night I was able to get a good night's sleep for the first time in a while.
安眠のために、寝る
For a good sleep, I try not to look at my smartphone before bed.