The hairy baby sleeping
A 2018 Pediatrics study found sleeping through the night overrated. Though, to be honest, I have skepticism about the potential for its validity due to:
- it was based on self-reporting by the mothers
- it only measured development through age 3.
RESULTS: Using a definition of either 6 or 8 hours of uninterrupted sleep, we found that 27.9% to 57.0% of 6- and 12-month-old infants did not sleep through the night. Linear regressions revealed no significant associations between sleeping through the night and concurrent or later mental development, psychomotor development, or maternal mood (P > .05). However, sleeping through the night was associated with a much lower rate of breastfeeding (P < .0001).
— Pediatrics. 2018 Dec;142(6). pii: e20174330. doi: 10.1542/peds.2017-4330. Epub 2018 Nov 12.
The Ninja Brain: Humans Can Prioritise Meaningful Sounds Even While Asleep:
We often think of sleep as a chance to switch off from the outside world, leaving us blissfully ignorant of anything going on around us. But neuroscience research has shown this is a fantasy – we still monitor the environment and respond to particular sounds while we’re sleeping (at least in some stages of sleep) – a fact that will be unsurprising to anyone who has woken up after hearing someone say their name.
A better example is anyone who has woken up after hearing their infant moving around. Part of the sensitivity is making sure the kiddo is okay. She is snoring? Good. Cannot hear anything at all? Is she breathing? This assessment that everything is fine occurs while still sleep-addled, which to me is amazing. Most likely the movement means in about 10 minutes she is going to wake up.
Probably this was good for keeping us alive on the savannah. Lions are nocturnal (night awake) where we are diurnal (day awake). It would be good for us to be able to sense the noises of a predator possibly coming to hunt us.