MM I was only ever hospitalized for being manic, and my pdoc suggested hospitalization for me many times when I was manic. Never for depression, I have had a much harder time while manic. Since we live in different countries I don't know if this is much use to you, tho I would think Canada and US are not that much different in this mannor. Inpatient should have different intake criteria for mania then it does for depression. Only makes sense. A person who is acutely manic may not feel like they are a danger, may not be a direct danger..like sui. But still poses a crisis that can end badly so it would seem they would evaluate your state of being and go from there.
If you cannot function because of mania, inpatient can and does happen. At least here. If psychosis is present then even more likely...wether or not you yourself know your psychosis is not a danger ( speaking for myself here) . I think they look at the whole picture. At least that is how it works here.
If you go inpatient for mania it's highly doubtful you will be getting an unmedicated sleep because that is usually the first step they take to try to bring the mania down. Get you sleeping with meds. From my experience only, that is how it has been handled.
In no way was my going in "silly". Inpatient circumstances are hardly ever silly, even if it is you who goes it would never be silly. I hope you can figure something out. I have been quiet but have been following, I really do think you need some extra more immediate help.