Continued and prevented one from going to bed (4,2)

I believe the answer is:

kept up

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'continued' is the definition.
(keeping up is a kind of continuing)

'prevented one from going to bed' is the wordplay.
'prevented' becomes 'kept' ('keep' can be a synonym of 'prevent').
'one from' is a charade indicator (letters next to each other).
'going to bed' becomes 'up' (I can't explain this - if you can you should believe this answer much more).
'kept'+'up'='KEPT UP'

'and' acts as a link.

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