I just scheduled an appointment with my GP and told him I needed a sleep lab. Insurance covered most of it, I think. I’m a little fuzzy on the details since it was a long time ago. If you’re in the US, you’ll likely want to make sure you get the details from your insurance company (assuming you have insurance; if not they can get pretty pricey). If you’re elsewhere, they’ll likely be free or cheap
There are only two things I can’t stand in this world: People who are intolerant of other people’s cultures, and the Dutch.