[giantg2]

"I would always ask her "is this winter or summer time?" just to show how this does not really make sense."

If the rest of your schedule keeps the same numeric time, then this does make sense. If your schedule allows for 9 hours of sleep before waking up for school, then you're still getting 9 hours. If you changed the numeric value, then it would either 8 or 10 hours since the school start time retains its numeric value.

"I believe most of these studies are performed in the USA."

The study being discussed is from Singapore.

[imarg]

My argument with my wife was not about the duration of sleep (nor has this anything to do with the schedule) but at what time a kid should go to bed. The reasoning behind this is that if a child goes to bed later it would be bad for brain development (or something) even if sleeping the required hours.

When I said that most studies are from the USA I was referring to studies in general (and about the children in particular) and not on the one discussed here. I confess, I might have been carried away a little because this has always been my pet peeve.