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Hmm I dont know.. I have never read that, all i know is that this morning I checked my temp at 5:30 which used to be 6:30 ( I try and check it at 7 every morning) and it was 97.5 which is normal. Then I went back to sleep and checked it at 7 (when I wake up) and it used to be 8, and it said 98.1, which would mean I ovulated yesterday because that is above my control line. So the time made a huge difference for me. I will check at 6 am and 7 tomorrow again just to make sure. I get up at 7 anyways so I can check at 6 then sleep another hour just to make sure. But I was thinking about checking another opk this afternoon. I have never gotten a pos in the afternoon so I dont know that I should try, they are only pos in the fmu.
This is what it says in TCOYF (I'll just type it word for word) -
'While British Summer time can be a welcome change, it can be a minor annoyance if it occurs right smack in the middle of yr fertile phase. The time change has the same effect as taking yr temp an hour later than usual in the fall (and thus they may tend to be higher than normal) & and an hour earlier in the spring (and thus they may tend to be lower than normal)
If you are in yr luteal phase when British Summer Time occurs, you don't really need to do anything. Just be aware that yr temps may tend to be a little higher or lower for the few days it takes yr body to adjust to the shift.
If yr body is sensitive to time differences however, and especially if you are approaching ovulation, you may want to adjust yr waking times for a few days leading up to the weekend. Using 6am wake-up time as an example, take yr temp as follows -
In the fall
Friday 6.00am British Summer Time
Sat 6.20am British Summer Time
Sun (once you put yr clock back an hour) 5.40am greenwich mean time
Mon 6.00am greenwich meantime'
Hope this helps & make sense, it's prob no good for you as we've already passed the time when the clocks change, but if you want to go back to 7am looks like you'll be able to after o