Why is silence necessary for sleep?
In: Biology
In the good ol’days when a mammoth was feast for the whole village, sleeping was kind of risky, unless you had your mates about you you were very vulnerable asleep.
Which is why even while asleep it became necessary for us to mantain a semi-aware state, so that should a bear come by and try to attack us we would sense him (hopefully) before he did any damage. Detecting sounds even when you are asleep is an important part of that. And that is why silence brings comfortable sleeps. Because our brains have an additional layer of certainty that no danger lurks we can sleep more peacefully.
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