If Hyao is going to be adding something that affects the Sanity bar, then maybe there can also be a event that unlock something that allows you to recover your sanity? Like a spring for example? It can have a condition before you are able to trigger it, like having between 50 to 1% of your current Sanity bar left before you can find it? That event could be in the same place as where your Sanity bar can finally be affected by something.