I had my annual physical yesterday (with a new doctor), and again the topic of doing a home sleep study came up. I'm pretty sure I have sleep apnea, but when I got a sleep study done last year, it was inconclusive. It showed only snoring, no actual apnea, but it also showed no REM sleep, which is strange. I'd really like to be able to take measurements over a longer period of time.
Primarily, I want to measure 4 things: EEG (for determining sleep stage), sound (snoring), airflow, and pulse-oximeter (for determining whether breathing is supplying adequate oxygen).
I've done plain sound measurements already, using the mic input of my laptop. EEG's are more challenging. Pro equipment costs a small fortune - even on eBay, there doesn't seem to be a good supply. I see a DIY project called OpenEEG, which might work. Obviously, I need electrodes and pre-amps, but it seems to me an off the shelf D/A card (maybe a labjack) might save me some time, and me more versatile for picking up the other inputs.
Most of the people doing home EEG seem to be into biofeedback, but from what I can tell the requirements are fairly similar.
I'd like to hook up with others who might be interested in building a home sleep study, or who can give me tips on finding the sweet spot between spending too much time and too much money. If I'm successful, I definitely want to post my recipes and software, as it's very likely to be useful for others.