Scheduling an IWR report

[jhunta]

We have a suite of IWR reports that our clients have access to.
A few of the reports have date range prompts allowing the user to potentially run a report over a large amount of data.
We would like to schedule these reports to run over night when the user selects a large date range.
I can use powerprompts to capture the date range prompt and issue a warning, but how do I schedule the report to run over night?Ã,  Is this even possible for IWR reports?
Has anyone tried anything like this before?
Any suggestions or guidance would be greatly apprecaited.