rebosante de energía y lleno de entusiasmo

= all bright-eyed and bushy-tailed

Ex. And for all you know, he might wake up all bright-eyed and bushy-tailed tomorrow and not remembered a thing!.

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= all bright-eyed and bushy-tailed

Ex: And for all you know, he might wake up all bright-eyed and bushy-tailed tomorrow and not remembered a thing!.