when you look at healthy controls who can sleep well and insomnia patients they look almost identical across the day but then when it comes to falling asleep right around that bedtime period the healthy controls are going all the way down the insomnia patients go down and down and down and then they have a rise back up right around that sleep onset period and then they start to drop back down again just as the control group but then they also often will have a spike in the middle of the night which then comes down