Changes

Sleepman uses two metal electrodes for the measurement of skin galvanic response. This method is usually done with the help of gel electrodes to achieve better conductance and lessen measurement error. However the device, with the expection of the adhesive Sleep enhancer attachable palm electrode, do not utilise conductive gel for the electrodes as that would be too uncomfortable for daily usage. It is then probable that the metal electrodes will irritate the skin of the wearer after prolonged usage, similarly to cases with [[Fitbit#Health_Risks|Fitbit]] or [[Apple watch#Health_Risks|Apple Watch]].