I’m thinking there may be some misunderstanding of Rule here, so I will check.
You can use the actions of any card on any site you rule. That is one of the main advantages of ruling them. Many of them require no supply, and an action that only costs a secret you aren’t using in some other way effectively costs you nothing, so there’s no point not using it.
Are you sure there are no actions on the board you want to take before resting?
Suggestion spoiler:
(You could have, for example, used Forest Paths to avoid spending 2 supply on Travel earlier, but that does cost a Favor so I assumed you chose not to. I can’t see any reason why you wouldn’t use Spirit Snare though.)