why is lying on sand at the beach comfortable, while a few grains of sand in a bed are irritating?

Question

why is lying on sand at the beach comfortable, while a few grains of sand in a bed are irritating?

In: Biology

Answer 1

Same reason being in the bathtub is comfortable but being in the rain is annoying. Small bits of sensory things being detected by our body when we don’t want them there are annoying, but there’s a threshold where enough of that sensory information at once becomes familiar and comfortable.