Crossword Genius

To be enjoyed when one's fairly tired? (3,5,2,3,4)

Ross

I believe the answer is:

the sleep of the just

I'm a little stuck... Click here to teach me more about this clue!

'to be enjoyed' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'one's fairly tired?' is the wordplay.
I cannot quite understand how this works, but
'one's' could be 'thes' (both can introduce a definite example of something) and 'thes' is located in the answer.
This explanation may well be incorrect...

'when' acts as a link.

Can you help me to learn more?

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