[machinelearning]

The probability of finding prey animals is low near a beach. This is bad if you’re a predator and need to find food. However it is also good if you want to sleep because the probability of being found by a predator is low.

There are several other things that make a beach inconvenient for hunting, e.g. large open spaces which compromise stalking behaviors, sand/water slows you down, tall skinny palm trees equipped with coconuts that serve as projectiles which land predators can’t climb but primates can.

I would imagine that there’s a similar explanation related to ease of hunting that could explain why rain sounds are calming.