Enigma 2

Set deeply am I within glass,

And through sand I easily pass.

Ever do I come in after,

Carrying on with light laughter.

With you, unknown, in choppy sea,

But not when sail turns into lee.

I run and hide within a lair,

Finding refuge in beastly hair.

For me you search, aloud you call.

When, distressed, you're against the wall.

What am I?

Author's Note

Please refrain from posting answers/guesses. Thanks!