Rock Around the Clock

Just to be clear:

Rocking motions do not necessarily always lull crying babies to sleep.

Sometimes, in fact, the rocking motion provided by, oh, I dunno... say, a Soviet-era train making an overnight cross-country trip lasting SIXTEEN HOURS in the dead of winter -- you know, just as an example I'm pulling out of thin air here -- will keep an infant not just awake, but awake and screaming all night.

ALL.
NIGHT.

Just to be clear.