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I was considering buying the sleep tracking mat, and I'm sure it mentioned it had dynamic waking similar to what you mention - to be honest I looked at so many devices though. (Also would be useful for turning off un-needed devices around the house when I jump into bed!)

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To minimize radiation exposure, the mat turns wifi broadcasting off when it senses you are in bed. So dynamic wakeup is off the table. I also find this setup annoying because there are times where I'm still in bed and trying to decide if I need more sleep, but it won't update until I physically get out of bed. It can do smart lighting control, but there is a delay when it has to connect to the wifi.

I would have preferred the wifi disabling being optional, or a bluetooth link to my phone, or even an ethernet port!

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