Crossword Genius

Being uneasy, suffer a reduction in sleep (8)

Ross

I believe the answer is:

restless

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

'being uneasy' is the definition.
('restless' can be a synonym of 'uneasy')

'suffer a reduction in sleep' is the wordplay.
I cannot quite understand how this works, but
'sleep' could be 'rest' (synonyms) and 'rest' is found in the answer.
The remaining letters 'less' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for restless that I've seen before include "Uneasy and agitated" , "Constantly moving about or fidgeting" , "Unable to relax or be still" , "Fidgetty" , "Worried and uneasy" .)

I've seen this clue in The Irish News.
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