I don't drink so cant really give you advice on this - i have done a bit of a search and found the following
"Your body reaches its BBT after you have asleep for four hours or more, so if you work night shifts or take naps you should take your BBT after your main sleep of the day. If you often get disturbed in the night or early morning, but usually manage to go back to sleep for another couple of hours, remember to record your BBT after your longest sleep. Take your temperature before you get out of bed or have a hot or cold drink because your temperature can change quite quickly.
If you have been drinking alcohol during the evening, your BBT may be high the next morning so don't confuse this with your mid-cycle rise, which should stay raised until your period. Although a hot teddy late at night can help you get to sleep, alcohol will actually disturb your sleep so that you sleep less deeply and may cause you to wake up a few hours later. And if you've been up late the night before your BBT may be raised the next morning, which makes for a confusing temperature reading the next day!
Stress, anxiety, illness, and infection also can raise your BBT temporarily, as will some drugs that are used to treat menstrual disorders, such as progestogens. "
On your chart the temp points are not a complete dot so maybe this will be taken into account. When you have your "real" increase in temp this should all sort its self out. Sorry if that makes no sence at all - because i don't drink i can't even share my experiences of temping with you. Hope you get the answer you want
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