I don't know what time the sun rises in BC, but during the summer the sun rises here at 5 o'clock in DST. That would be 04:00 without. That means people (not everyone can darken their room sufficiently) waking up really early, and that can't be healthy.
That's admitting it's bad for your sleep. So why would sleep experts say otherwise? Why do they think an early sun rise is better? Perhaps it's situation dependent.
