I might be wrong, but I believe the variable is for times when you talk in the morning. Like when you wake up and you get a scene in the bed
I double checked and it definitely isn't working that way. Here's an imgur album with screenshots of the behavior in action:
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In the first screenshot she's (barely) asleep and variable 152 is 0. In the second screenshot she's woken up and variable 152 has just changed to 1. In the third screenshot I've ended the night and the value has gone back to 0.
On further thought the real bug is probably that "I want to H" checks variable 152 instead of variable 455. Variable 152 seems to behave like a boolean value indicating whether you've woken her up tonight, whereas variable 455 is actually the total number of nights that you've woken her up.