I am connecting an old Zeo EEG (Zeo Sleep Tracking - POLYPHASIC SLEEP | Sleep Right, Live Well) to my Raspberry Pi computer via a USB connection so as to extract the sleep stage and brainwave data from the Zeo EEG to my Raspberry Pi where I can then use the Raspberry Pi’s IO pins to activate external hardware that will generate different types of stimuli (e.g., tactile, visual, audio, etc.) during REM sleep in an attempt to induce lucid dreams. The Zeo EEG has API (Getting Started — Zeo Raw Data Library v2.0 documentation) that can be used for such purposes plus it is very comfortable for wearing while sleeping. Unfortunately the Zeo EEG is no longer commercially available, and the EEGs that are available will not interface via Bluetooth with the Raspberry Pi computer (or at least I do not know how to make them do so).
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