Mattresses

For a warm climate, it makes real sense. The Serta iComfort Cooling uses gel-infused memory foam and a breathable cover to pull heat away from the body. In Hawaii's year-round warmth and 60 to 80 percent humidity, that cooling can be the difference between restless and restful sleep.

Somewhere in the medium range. A medium to medium-firm mattress, roughly 5 to 7 on a 10-point scale, keeps the spine supported by cradling the lower back without letting the hips sink too far in. That balance is what back sleepers tend to need.

No. The beds use built-in slat support, so a box spring is not part of the equation. The mattress sits right on the slats, which gives it the support and the airflow it needs.

Around 7 to 10 years for most. The signs that it is time are hard to miss: visible sagging, lumps, waking up stiff, or a general drop in comfort. Rotating it 180 degrees every 6 months helps it wear evenly and last longer.

Lie on it the way you actually sleep, for a good 10 to 15 minutes. If your hips or shoulders feel pressure, it is too firm. If your lower back sinks in, it is too soft. The right one keeps your spine in a neutral line.

Yes, give it a month or two. Most mattresses take 30 to 60 nights to fully break in as the foam adjusts to your weight and the way you sleep. That first-day firmness usually eases off over those first several weeks.