Who I have the same questioned this topic

I have monitored the Data Bandwidth since 03/28 and noted that between the hours of 12:00am and 06:00am bandwidth is 1.5mbps to 2.0mbps.  After that I also noted that the bandwidth drops to appx .08mbps.  These tests have been on at least 3 other phones with the same results in the Phoenix, AZ area.  Is anyone else experiencing this?