snug as a bug in a rug

Adjective

colloquial not-comparable

(simile, colloquial) Very cosy and comfortable.

Japanese Meaning

非常に居心地がよく、快適な状態

The baby was snug as a bug in a rug in her crib, sleeping peacefully through the night.

赤ちゃんはベビーベッドの中で毛布に包まれてとても暖かく居心地よく、夜通し穏やかに眠っていた。

Sense（1）

(simile, colloquial) Very cosy and comfortable.