Curious, it's curious how that meditation has different effects. If I wake-up at night and am a little stressed and have issues getting to sleep, I've often done the small universe while still in bed and just drifted back to sleep.
I may have a similar lunch time issue myself. I'm guess I'll just adapt and do some smaller meditations.
I have little advice, but some sympathy to offer. If you look you can find some place on the good-better-best scale of practice. 
My current dilemma is to find time for some nice 2 hour meditations.
You are perfection,
Iam2 
