Angela Pretorius

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Why did babies evolve to wake so frequently at night? Did frequent night waking have some evolutionary benefit to babies that outweighed the risks of sleep deprived parents?

I don’t know if there’s been much research into the long term effects of sleep training? The best information that I could find was this article https://www.bbc.com/future/article/20220322-how-sleep-training-affects-babies.

Can we please be clear that sleep training and locking kids in their rooms should only be done as a last resort. And if you do lock your children in their bedrooms then at least leave a potty in their rooms.

I have some bad childhood memories of bedtime battles and spending hours on end lying in bed pretending to be asleep and having to face the terror of waking up from a nightmare alone because I didn’t want to get told off for being awake in the night.

Here is the secret to successful co-sleeping: Get a large playpen that can fit a double mattress. Then once the baby is asleep you can slip out and go to the loo/have sex/get a glass of water.

More tips:

If the baby needs changing after a night feed then first roll him onto his tummy, then change him, then roll him back onto his back. My boy would usually sleep through nappy changes so long as he was changed on his tummy.

Put the baby to bed in leggings rather than sleepsuits, so that nappy leaks can be dealt with without waking the baby.

There are two plausible ways to cut sleep duration without harming cognition: increasing the proportion of slow wave sleep that is spent in deep sleep and reducing REM sleep.

Slow wave sleep is needed for synaptic homeostasis (e.g. see https://www.sciencedirect.com/science/article/abs/pii/S1087079205000420). There are evolutionary trade-offs between time spent awake, time spent in light sleep, and time spent in deep sleep. Deep sleep is more restorative than light sleep but an animal is more likely to be awakened from predators in deep sleep. Humans sleep less than other primates but spend more time in deep sleep than other primates - maybe because our ancestors took turns to stay awake and watch for predators at night?

I’m not so sure what the function of REM sleep is. Maybe something something emotion learning something something? There are cases of people on antidepressants going months with no REM sleep. There are also cases of people on antidepressants who say they have no emotions so I doubt that it’s possible to cut REM sleep without side effects.

I used to think that my Dad was a bit bizarre because he washed everything before he put it in the dishwasher. Now I know that he’s not alone.

I hand wash everything but for me it would be

  1. Lick the dishes clean before putting them in the dishwasher.

Do you have a reference for the claim that Y-chromosomal Adam and mitochondrial Eve lived around the same time? The only information that I could find online was a bunch of studies that found various estimated ages for mitochondrial Eve and Y-chromosomal Adam that all disagree wildly with each other. Most of them have error bars of at least 50,000 years.

I wonder how often the CoCo point is attained in real life transferable utility bargaining games.

Eg. Do most houses sell for half way between the seller’s walk away price and the buyer’s walk away price? Do most employees earn a wage that is half way between the employee’s walk away wage and the employer’s walk away wage (at least when the employee’s walk away wage is above the legal minimum wage)?

On second thoughts...

If someone asks this AI to translate natural language into code, who is to say that the resulting code won't contain viruses?

Suppose that an AI does not output anything during it's training phase. Once it has been trained it is given various prompts. Each time it is given a prompt, it outputs a text or image response. Then it forgets both the prompt it was given and the response it outputted.

How might this AI get out of the box?

70% of 84 hunter-gatherers studied in 2013 slept less than 7 hours per day, with 46% sleeping less than 6 hours.

The study in question also found that the hunter gatherers spent 8-9 hours in bed each night. Sleep duration was measured using those Fitbit trackers that always tell you that you only slept four hours when you’re sure you slept about eight hours. If you move around in your sleep then the tracker assumes that you are awake.

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