up to one's ears

It was glorious up in the old-fashioned feather bed, with the blankets pulled up to one’s ears, listening to the roar of the wind, the pelting of the hail and snow and the war of the elements, until one fell asleep.

There are few pleasanter sights about farm premises than to see, as the short winter day is drawing to an end, and the twilight is stealing around the ricks and buildings, a nicely sheltered yard full of contented cattle deeply bedded down in clean bright wheat straw, and settling themselves comfortably for the night; and, when one pulls the bed-clothes up to one's ears, one can go to sleep thinking happily that they too are enjoying a refreshing sleep.

When one's at it, one's at it, you know; and if one only has the chance now and then, one would be precious stupid not to stuff oneself up to one's ears.