Hi Caledonia - interesting post. It's definitely useful to chart your sleep in some way. Excel charting is a good way, or just a simple text file can help. I don't agree about taking the samples according to one's personal schedule. We are seriously hormonally dysregulated, and the altered circadian rhythms are indicative and a result of that. I think taking the samples as close to the actual recommended time as possible is probably more useful in showing what's going on in the dysfunction, and an important part of trying to readjust the rhythms back to some semblance of normalcy. If the cortisol bottoms out at 8am and then shoots up at noon, or crashes at midnight, or whenever it's doing, that is important information to have. If you skew the samples by taking them at non-standard times, the results you get not only are going to be less revealing, but conceivably could also end up being detrimental when it comes to treatment. That's just imho, but it seems to make sense that if we're trying to correct back to normal, we should compare to actual normal to see what's off.