It's great to have you here @Manhartz! Fitbit Blaze will start tracking your sleep when it detects no movement at all. It may be that you're moving a bit more so it's not detecting your sleep right after you go to bed. You can find more information about how sleep is calculated by checking this article What should I know about sleep stages?.
Also, you can try doing a test using your Fitbit app and start a sleep and then check the information that it will give you.
Hope this helps! Keep me posted.
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