Apple Watch Sleep Application App - xcode

I am looking for someone to program a simple apple watch application that detects REM sleep cycles and opens a file on my computer on the 5th REM STAGE. (ex. like a music file or a script file.) Similiar sleep detecting apps exist like "Sleep++" and "AutoSleep" but do not open files on pc's during 5th REM sleep stage. No UI design is necessary. App does not need to look good, just function. The app will not be a consumer app but a tool for used for sleep experiments.