Right, bedtime.
Today I did a bunch of mattress-vacuuming, applied a large hypoallergenic mattress-condom over it (supposed to be breathable, we'll see), refreshed all my bedding, and had an air purifier running all day in the bedroom (it was very whooshy while I was messing with the bedclothes).
Here's hoping I wake up a little less snotty for once.
If it makes no difference after a few days I guess I can eliminate dust-mite-poo allergies...