[greggman3]

In general they do pay for your time outside of work and you agree by taking the job.

Let's say you work strict hours 9am to 5pm M-F. On Thursday at 8:47pm you happen to think of a solution to a problem you're having at work. Are you suggesting the company should pay you more because the idea occurred outside of your strict hours?

In general, companies pay white collar workers / knowledge workers, for their knowledge. That happens regardless of when that knowledge is acquired. It seems pretty common sense and there are also plenty of laws to it up. Any other arrangement would seem full of issues.