Peak time for being on the internet in Britain is 21:00 on Wednesdays, the Office for National Statistics (ONS) suggests.
By contrast 04:45 on weekdays is the quietest time, it says.
The ONS has started analysing internet traffic volume for the first time, using publicly available data from one of Britain's largest internet exchanges.
However, it acknowledges the early results are not conclusive.
One expert told the BBC the data used had a significant limitation because it was unlikely to have included box-set streaming.