I suspect we would see something similar if we looked for the same phenomenon in other countries. What is probably happening is that the rising demands of the working week are increasing the amount of sleep we need. If so, having less time available on weeknights might mean we can only meet this increased need for sleep on the weekend – if at all. Time with family, exercising and other demands on our lives outside work probably allow us all less scope than we would like.
So are we sleeping less? No. But we may be sleeping less well than we need to… More at Mashable.
Interesting stuff. The presumption that we are sleeping less is natural, but it certainly feels as though more needs to be crammed in to awake times.