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Alarm clock that reads my brain activity and only wakes me up at the point in my REM cycle, where i'll feel refreshed waking up.
Similarly I want something that I can set to put me to sleep for X hours guaranteed. Insomnia is a bitch and ambien is awful. I just want to get ready for bed, set my alarm, and wake up exactly when I need to.
These exist in smartwatches. Not reading your brain activity but tracking your micro movements (or macro) and vibrating on your wrist when you are in a lighter stage of sleep around your alarm time.
Sounds like a fun Hack a Day-esque project for someone out there. If you can secure it well enough to stay in place while you sleep, can probably make something with a repurposed Star Wars Force Trainer headset, an Arduino, and some means of triggering an alarm (the fact that we're just out there selling EEG tech as a kids toy is nuts to me).
I just wake up a few minutes before my alarm due to my internal clock. Doesn't matter what time I go to bed.
I believe this does actually exist but the most reliable one is from a company that went out of business, so you have to buy second hand
Edit: Its the Zeo Sleep Manager
Along somewhat similar lines, I wouldn't mind a fan that monitored my temperature while sleeping and adjusts its speed accordingly.
Totally possible with homeassistant. They also make temperature controlled "smart" beds.
https://community.home-assistant.io/t/adaptive-fan-speed-control-based-on-temperature-and-speed-range/678152