monitoring Bandwidth usage of devices

Hi all,

I am totally new to Videotron home internet and i am so far so happy with it, specially the speed! my service was installed yesterday morning, today i checked the usage at 7 am in the mobile app and it says 10 GB of download (!) which 5 of it was between midnight and 4am which doesn't seem right as long as i didn't run any updates or ... during the night.

I just want to know if there is any way i make sure what was that weird internet usage about? maybe a trick that i can monitor all of my devices' bandwidth usage?

regards

soheil