Researchers at Victoria University in Melbourne concluded that 78% of school-aged children slept through a smoke alarm blaring for 30 seconds. The study, published this month in the journal Fire and Materials, asked 79 families to trip their smoke alarm after their child had been asleep between one to three hours.

The group of 123 children — the average age was 9 — was split in two according to which children had hit puberty. It was an intentional division: plasma melatonin levels — melatonin, a naturally occurring hormone, helps induce sleep — decrease in conjunction with puberty onset.

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