We spend a whopping third of our lives in bed -- great news, since everything from memory to emotional well-being hinges on our getting about eight hours of shut-eye each night.

It follows that finding a comfortable mattress would reap big rewards.

Unfortunately, typical mattresses are often a lasagna of nonbiodegradable synthetics, pesticides, and potentially carcinogenic toxins.

No need to toss and turn about how your bed might compromise your own health or the planet's, though: We have more green bed options now than ever before. Read on for the best eco-picks that offer both superior support and sleep-tight comfort.

Beneath the Bounce
Innerspring Mattresses
Most of us sleep on an innerspring bed, or steel coils surrounded by layers of foam and fabric. Manufacturers sometimes coat those coils with chemicals to prevent deterioration. In addition, the production of a mattress's fluffy cotton or wool filling can release harmful pesticides and dioxins into the environment through dyeing, bleaching, and processing.

New, earth-friendly innersprings sidestep these perils by using steel coils without chemical coatings and pesticide-free organic cottons and wools.

Lifekind, Natural Rubber/Innerspring Combination Mattress
This club sandwich of a mattress combines the soft, bouncy feel of an innerspring with the flexible contours of natural rubber. The coils rest between layers of organic cotton padding that doesn't shift or hold body impressions. It's all topped by 2 inches of natural rubber and a woolen cover. $2,195 for a queen.

Good Night Naturals, The Dream
Here, steel coils get wrapped in layer upon layer of organic cotton and wool. Good Night uses Pure Grow wool, which certifies that it's chemical-free, from grazing to shearing to packaging. $1,049 for a queen.