There's the Dreem2 headband, but I don't think its available to consumers in the USA anymore. Maybe it is in other countries Its basically a reusable EEG devic

There's the Dreem2 headband, but I don't think its available to consumers in the USA anymore. Maybe it is in other countries Its basically a reusable EEG device connected to your phone, aka a sleep study every night, but maybe slightly lower quality I'm sure with persistence and ingenuity there should be a way to get it