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@Janece Click on your Activities on the PC at this link and examine the graphs of Calories. That will highlight the extra activities in Green and Yellow.. You can then time space it.
If you had an elevated HR on the Blaze that will also contribute to the higher calories.
Best AnswerAdditionally, mine shows that I had peak periods of calorie burning from 4-8 a.m. which can't possibly be since I was asleep at that time.
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@Janece, That is a very restless sleep! 
First, I am guessing that you were wearing the tracker in bed. I once had it counting steps when it was on a table. It was on a surface that was vibrating due to a device with a fan. I also suspected once when putting it back on after a bath that it was somehow tracking HR from something. I was never able to duplicate it.
If you were wearing it, then how tight was it. I have seen my current steps showing more than actual. The tracker was loose on my wrist. I tightened it one notch and it started tracking accurately. My wrist routinely changes size by one notch. I make sure that it isn't on the loose side when going to bed. I have heard that if it is too loose, the HR doesn't record properly. In my experience it is usually loosing beats.
My suggestion is to check HR and steps to see if they sync with calories burned. HR should sync, steps shouldn't but might. If these ideas don't help you identify the issue, then I suggest contacting Fitbit Support.
Good Luck!
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
@Janece THanks for responding because this will help others..
Let's go to the next stage and create a manual Custom activity in the PC for the period 4-8am for your HR . It's easier to create it in the PC, but the downside you need the calories.. BUT again, if you create the Manual Activity and then initiate from your phone it automatically inserts the calories.
You will get this type of graph which today, for my morning sleep is a plot every 2.4 seconds....., the downside, if you use this technique to measure activity it averages the calories over time and you could lose/gain active minutes if the average calorie burn is over 3 times your BMR
I have labelled my Custom Activity Blaze HR. The second image is how you can "home" in on sections and analyze the results. I do that occasionally to examining my missing heart beat.. Not detectable by the way Fitbit records. Cardiologist has passed me with flying colours.
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