dreamt of tsunami

i had a dream... few days ago. i wasn't sure about the detail, but i was in a glass house with the couple and some friends (i can't remember).

tsunami hit us, but no casualties among us.

the only part that i remember vividly is the waves hit the glass windows in front of me, and i had no fear over that. i wonder why. and it took me quite some time to know that it was actually a tsunami attack.

what does it tell?