Inform 7: Scene Begins After....

I want to know to to make a scene begin after something, but I can’t seem to do that.

When I type, for example:

The Moving Train begins after one turn when Ellen is awake. [I added that a person can be awake or sleeping]

It doesn’t work, says it doesn’t understand.

But this…

The Moving Train begins when Ellen is awake.

…Works well. Any idea?

Try

Moving Train begins when Ellen has been awake for exactly two turns.

or

Moving Train begins when Ellen is awake for the second turn.

(À la §9.15 of Writing with Inform.)

I’ll try that…

The extension Phrases For Adaptive Pacing has several miscellaneous things that may or may not be useful there. Just FYI.