Why is my MacBook Air slow to enter sleep mode?

My partner's goes to sleep instantly, mine takes about 30 seconds - most obvious difference is that I have MS Office installed (but not running).  I've tried resetting SMC but no benefit.  Help would be much appreciated.

No, nothing whatsoever.  Have just upgraded to the latest OS (10.8.2? Don't have the MacBook to hand, but was latest a few hours ago :-D), but hasn't helped.  Presumably some process is running that takes a while to close - but wary of closing down processes without knowing for sure what they're doing!
In the *past* I had an external DVD drive attached - used it when installing MS Office - but hasn't been connected for months, and MacBook has been switched on and off and restarted several times since.
Grateful for any help you can give!
cheers,
Glynn

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