That is really strange. I also use an AW to unlock my watch, but am not having those issues. It could be related to the AW. Have you tried turning that feature off and on again?
I get the same think every once in awhile if I am too close to my MBP. Think the apple watch unlock is a little buggy and is somehow triggering the wake-up.
I did hard reset AW and it was not resolved.... do not why it is happening. It is occurring intermittently. I thought it could be 'wake for network access' feature but it was not. I have also tried turning on/off the feature.
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Hmm... could it be software issue then?
I'm pretty sure it is software.