Subject: Tide pool life

When I walk on the beach at different times of the year, 
I find the sand moves onto and off of the shore. In winter 
and early spring I see many sea stars of various kinds,
sunflower stars, anemones etc. As the spring progresses 
into summer and fall, the sand moves in and the places I 
saw these animals are covered. Large rocks are covered, 
the beach looks like nothing more than flat sand. My 
question is: what happens to the tide pool life when the
sand moves in? Does it go into a stage of hibernation until
uncovered? Can it survive under all the sand? If so, how?

Re: Tide pool life