Comment by bluepaper

That seems like a rather small sample size, both in number of people involved and the fact that it the results seem to be based on only a couple of points. (what's the variation in the sleep patterns normally? What about other factors that may affect their sleeping patterns? e.g. previous nights' sleep, exposure to other media content while not at the sleep lab, etc.)

I'm genuinely interested. I do understand that this may be a basis for further study but how much can we really take from this study to encourage further research?