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Body Battery overnight when watch is not worn

My "body battery" number in GCM always has a value starting from the point I put my 945 on my wrist after waking up (I do not wear it while sleeping).  Where does it derive this starting value from?  It's not simply picking up where it left off the night before as the values are always different.

For example, last night the value was at 96 (I assume percent?) when I went to sleep, yet when I awoke from a very restful full night of sleep this morning, the value had dropped to 73.

Coincidentally I do wear a Vivosmart 3 when I sleep (it's my daily tracker) and just using the above example from last night the stress readings it recorded were very low all night so at least from that perspective I seemed to have a restful night of sleep as well.

So I'm confused how the Body Battery is getting my starting numbers from the 945 each morning.