Ongoing loss of space on internal HD

27 inch late 2009 iMac 3.06 GHz Intel Core 2 Duo with 1TB internal HD running OSX 10.9.2
I've noticed a continuing rapid loss of internal HD space, in the last three months I've gone from over 300GB of free space to 230GB.  I've not been adding any files of any size (video files etc).
Yesterday, my TimeMachine completed a scheduled backup at 17:44 and I put the compter to sleep at 18:14.  All I was doing in the remaining 30 mins since the last backup was complete was scriptwriting (using a scriptwriting program called Movie Magic Screenwriter 6).  The entire file for this script is 271 KB.
This morning, within minutes of me waking up my iMac, TimeMachine started to backup 2831 files constituting a total of 145.1MB of data.
How is this even possible???  How did so many files get generated when my iMac was asleep and is this why I've been steadily losing free space on my internal HD when I'm so careful as to not clutter it up with large files?

Timemachine has just started it's second backup of the day and is now backing up 60336 files, 3.19 GB of data! 
HOW IS THIS POSSIBLE???
I've not created any new files at all in the last hour since the last backup...
What is going on here?

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