Data

[tcfed]

My data is being used in the middle of the night…when my phone is not in use

[HALIMACS]

Other than above explanations (which are very likely the case) other possibilities is apps / updates which may be occurring or you may have a hotspot set and someone is using data from your device. 

[hTideGnow]

HI @tcfed   PM only update data twice a day, so, it is a total usage of the last 12 hours

[softech]

@tcfed   data did not get consumed during the night

With PM , the data entry only updated twice a day instead of keep updating throughout the day

So, any data entry you see on Usage history in fact a TOTAL usage between that timestamp and the timestamp of the previous data entry.  So, no worry

[BKNS27]

@tcfed 

This is normal, PM are updating your usage twice a day…around midnight and around noon.