Question

properties, induces sleep, boosts the immune system, lowers cholesterol, and helps the functioning of the thyroid, pancreas, ovaries, testes and adrenal glands. nighttime exposure to artificial light suppresses melatonin production. we usually go buy a pill for that, but it turns out that, just hit the light, and you can be healthier.
for me, im going to hit the sack. way past my bedtime as it is, and im going to see how dark it gets. it is the longest day of the year, after all.
and, i am going to welcome the darkness.
how does laduke support her claim that we would be healthier if we slept when it was dark?
with a personal story about her own sleeping habits
with statistics about sleep, light, and melatonin production
with facts and information from medical and biological researchers
with examples of people who felt healthier when they slept during dark hours

Explanation:

The text mentions the properties of melatonin (inducing sleep, boosting the immune system, etc.) and how nighttime exposure to artificial light suppresses its production. These are medical and biological facts.

Answer:

With facts and information from medical and biological researchers.