noun
sleeping while embracing someone; cuddling in sleep
Refers to the act of sleeping while holding another person, often in a romantic or parent-child context.
赤ちゃんと抱き寝すると、とても安心する。
Sleeping while holding my baby makes me feel very secure.
恋人と抱き寝するのは幸せな時間だ。
Cuddling in sleep with my partner is a happy time.
添い寝 means sleeping beside someone, often a child, without necessarily embracing them. 抱き寝 specifically involves holding the other person.
Compound of 抱き (daki, 'embracing', the continuative form of 抱く daku) and 寝 (ne, 'sleep').