The open dots are generally if you are waking at a different time than normal. Basically you have an hour window for your temp to be accurate. If you normally wake at 7am, you can enter your temp between 6.30-7.30, but if the time is outside those then it will give you an open dot. Also other info you enter might affect the dots, it's usually if you have been drinking, have said you're sleep deprived or had an illness.
That is interesting because I went back over my times and I normally do my temp between 5 and 6am.. a couple of times I have taken it later, but I normally do it between 5 and 6.. Oh well, I guess I just have to be patient..
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