Does Cooling Your Mattress Actually Improve Deep Sleep Cycles or Just Mask The Problem?

I have officially reached peak obsession. After reading one too many papers on thermoregulation and the circadian rhythm, I invested in a full-blown water-cooled mattress topper. Don't get me wrong, the sensation of sinking into a sub-sixty-degree bed is pure bliss, and my Oura ring metrics are showing a consistent 15% increase in deep sleep duration over the last two weeks. But here is the rub: do I actually feel more energized, or is my brain just enjoying the novelty of a glorified ice pack? I find myself wondering if I am truly optimizing my biological recovery or just creating a highly expensive dependency. My partner thinks I am losing my mind with these protocols, but the data is hard to argue with. Have any of you experimented with temperature control, and more importantly, did you notice a legitimate shift in your cognitive performance during the day, or was it all just vanity metrics? I am curious if I'm hitting a wall of diminishing returns here.