Glad to hear you’re implementing sleep restriction as a way to build sleep drive and reduce nighttime wakefulness!
It sounds as though you aren’t recognizing a lot of sleepiness when you go to bed but you don’t mention any issue with falling asleep at the start of the night. Do you usually find it easy to fall asleep at the start of the night? If so, this suggests that you are sleepy enough for sleep when you go to bed. If not, you might find it helpful to think of the start of your sleep window as your earliest possible bedtime and only go to bed when you feel sleepy enough for sleep once the start of your sleep window has passed (while still keeping the same final out of bed time in the morning).
It also sounds as though you might be spending a lot of time in bed when being in bed doesn’t feel good (you mentioned tossing and turning and feeling an adrenaline rush when you wake before the end of your sleep window) and this could be creating arousal that makes it harder to fall asleep.
With this in mind, you might find it helpful to work on lowering arousal since that could be an obstacle to falling back to sleep. We can help reduce arousal by actually getting out of bed when being in bed doesn’t feel good, by not checking the time during the night, and by eliminating all sleep-related effort and striving.
Often, it’s our desire to fall back to sleep, our desire to sleep until a certain time, and/or our desire to get a certain amount of sleep that is the biggest obstacle to reaching those goals!
I hope this helps.
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