Thomson Wireless router - strange usage

[#1]

Any ideas why  i have unexplained internet usage from Midnight - 08.00 am?
its only about 70-80 kb per night.
I live alone and nobody else uses my plusnet connection.
Thanks

[#2]

Hi Bulb,
Don't worry - This is perfectly normal.
It's what's called "background traffic" and is a really, really tiny amount.

[#3]

Cheers Mate