The sleep study in a sleep study lab was with the EEG type electrodes caulked on all over the scalp, and wires all over the place. That was a decade ago. Now I am told it is done with something in your own home with two spots that go on your temple and a little tube in your nose . . . It diagnoses sleep apnea and it can even diagnose narcolepsy. Really??? A home sleep study. Fascinating. One problem with the sleep lab is many people can't sleep there that first night and insurance will only pay for that first night. I don't see how it can diagnose narcolepsy, though because that was done doing a study that night as well as the next day.