These are the pictures which I saw on the Internet of someone being sleep tested:
My apparatus was completely different.
I told my family doctor about the experience, and as I imagined, he was not aware of the fact that the test could be done at home.
I phoned the sleep clinic today to discover that they were able to extract enough data from the test, even though I felt that I barely slept at all. This means that I won't have to do the test again, although I have a feeling that the data which was extracted was not particularly representative.
The results are supposed to arrive after about ten days; I'm not going to hold my breath waiting.