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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 have an Aqara FP-2 doing just this thing. It works pretty well after setting up zones. Those get pulled into Home Assistant and then you can tie those to automations to control lamps or what have you.
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.