Does a Greentek sleep cap make sense with PiEEG 8 channels?: Is not Robert Oostenvelds Nike headband enough for this purpose?: https://pieeg.com/blog/ https://forums.raspberrypi.com/viewtopic.php?p=2208393#p2208393 https://www.researchgate.net/publication/332321992_Development_of_electroencephalography_EEG_data_acquisition_system_based_on_FPGA_PYNQ