1. A method, comprising: obtaining data indicative of brainwave activity; normalizing at least one frequency range of said data to change a power level of the data in said at least one frequency range relative to data in another frequency range, to form normalized data indicative of brainwave activity; a second normalizing of the data, to form double normalized data, wherein said second normalizing comprises normalizing frequencies across time; and analyzing said double normalized data indicative of brainwave activity utilizing a computing device to provide at least one parameter indicative of sleep state from said analyzing.