What does a "" wake reason mean from powerd?
Starting with macOS Sierra, Apple started a total rebuild of the Console app and the log system.

And, as time progressed, Apple's increased focused on privacy has resulted in some macOS log entries to be redacted  to hide information Apple deems as being sensitive. 

So, for whatever reason, the appearance of &lt;private&gt; denotes information that has been redacted from the logs. Unfortunately, this sometimes renders parts of the logs worthless in terms of troubleshooting a problem.

Regardless, there are many reasons a Mac can wake up from sleep and it's unlikely that it waking up was related to the problem you had this morning.