何も知らないで幸せそうに寝やがっての英語

There is no saying what may turn out to be our blessing.

Ignorance is bliss.

A misfortune may turn out a blessing.

I was too happy to sleep.

You never can tell what form [shape] good fortune will take [will come in].

To be frank, I don't know if I am happy.

Not every man can be happy.

I thought I'd never be happy again.

an absence of concern for the welfare of others

“Every cloud has a silver lining.”【イディオム・格言的】

I do not regard the matter as a misfortune

the condition of being unhappy

Never have I been so happy.

“Every cloud has a silver lining.”【イディオム・格言的】

There is no saying what may turn out a blessing

True happiness consists of desiring little.

unspeakable happiness

a sound and dreamless sleep

carefree and happy and lighthearted

Money does not always bring happiness.

All of them might not be happy.

It would be a sin against Heaven―sinful―impious―not to be thankful for so many blessings.

the condition of being content

Happiness depends, not so much on circumstances, as on one's way of thinking.

You can never be happy if you feel envious of other people.

When I came to （myself）, I found myself lying in a strange place.

I wasn't always happy.

I've never been this happy before.

a state of being unhappy

Every man can not be happy.