Me 31, married to Wolf since 09/10. Emerald Angel Baby left us 10/6/14. Rainbow Baby due Sept 3 and it's a GIRL!
It's not the bedtime, it's that you've been sleeping for three hours (at least) when you take your temperature.
You can try and see what your patterns are. Some people can get reasonable temperatures in spite of irregularities (many mothers don't get three hours of sleep in a row, but can still predict ovulation reasonably accurately)
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