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HR readings while sleeping/convert to active watch

I have a samsung galaxy watch.  I need to track HR while sleeping. This means i need a graph of my heartrate, through out the night while sleeping.... not a rem sleep graph, but actual HR graph.


I know I'm asking alot, as this watch is not a fitness watch, but hoping its possible.  Also is it possible to install active watch firmware on a galaxy watch and make it a real fitness watch?