Regarding the kiosk, I wholly expect that an unattended device with YT on auto play will ratchet up the length/frequency of ads as long as they're never skipped.

Someone who falls asleep watching YouTube will skip ads, unless they're asleep.

The idea is that if YT can infer that someone is asleep (location, no movement, no sound, low light, night) that they can show the longest, most skip-inducing ads that they've got since they know they won't be skipped.

The difference between the kiosk and the sleeper is that if the sleeper gets a 20 minute ad at 2pm while they're eating lunch, they'll skip it. YT is incentivized to show the most profitable ad that someone won't skip.

The value in identifying sleepers isnt showing a long ad, it's showing a long ad with the certainty that it won't be skipped.

Sure, but why would I, as an entity buying advertising space, pay the same amount when YouTube is just going to try to show them to people who are asleep, that can't see the ads, and thus would have no effect anyway?