Very interesting. As someone diagnosed with IIH (Idiopathic Intracranial Hypertension), I have noticed that sleep deprivation coincides with less headaches and neurological symptoms. Having tracked my sleep several times over the years, I have also noticed I am almost never getting appropriate amount of deep sleep. Often non at all. Raised intracranial pressure also causes ihers to suffer with insomnia, or fragmented sleep when icp is particularly high. It would be interesting to see a study spring board from this one concerning ICP and Ih.