I am doing CBT-I and find that within a week of sleep restriction my sleep drive is so strong that I can fall asleep over powering the hyper arousal and strong breathing, heartbeat. BUT it is important for this that when you are not sleepy- don’t be in bed. I feel like you need to do both. If you toss and turn more than 20 minutes you need to get out of bed a Do something relaxing. Otherwise you associate bed with anxiety. I personally still have trouble with night awakenings, but it has improved sleep onset IF you get out of bed when tossing and turning.
Good luck to all of us!