Extremely edgy books interrupting cycle of sleep (8)

I believe the answer is:

antsiest

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

'interrupting cycle of sleep' is the definition.
I can't tell whether this defines the answer.

'extremely edgy books' is the wordplay.
I cannot really see how this works, but
'books' could be 'nt' (New Testament) and 'nt' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

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