Becoming sleepy and needing bedtime visibly, especially when
talking about events that might occur past your bedtime.
From Cinderella's "turning into a
pumpkin" at a certain hour, here we have events that certain
people generally don't get to because it'll interfere with their bedtime.
We tried getting reservations to <
snazzy restaurant>, but they only had a
slot at 10pm, which we
gave up because Autumn starts pumpkinizing around then.