What does "Recent Change in Time to Bed" mean?

The "Recent Change in Time to Bed" trend is sent if there is a significant shift in the time the individual went to bed in the previous 24 hours compared to the previous 7 day period average, which may indicate changes in routine or bed patterns. 

Select the trends notification to see the change in time to bed in the last 24 hours compared with the previous 7-day average.