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Bed Occupancy Sensor?
(lemmy.ml)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
I also used a mmWave sensor in the past for this, one from a youtuber. Worked well enough for my case, but it had some interruptions during the night.