I'm a retired math professor and I do agree that 15 minutes can be seen as a 100 percent improvement on 30 minutes. You fell asleep twice as fact. When something doubles it is 100 percent "better" (or worse, depending one what you are measuring). Another way to look at it - you went from -30 to -15, because you are in the negatives while awake - just a different model here, not necessarily the only way to look at it. A lot of this is predicated on how models are set up and which variables are accepted as "initial" and which are considered negative/positive. There are options in how to set up the problem. Relaxium is not telling us their chosen problem set-up.
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