How big to go is the first thing you need to know. Mattresses come in many sizes:

• A twin mattress is 75 inches long by 39 inches wide and great for children and teens.
• An XL twin mattress is 80 inches by 39 inches, which offers a longer length for taller youth.
• A full size mattress is 75 inches by 54 inches and works for young adults and smaller guest rooms.
• A queen mattress is 80 inches by 60 inches and is perfect for couples or single sleepers wanting a little extra room.
• a king-size mattress is 80 inches by 76 inches, which gives couples room to sleep comfortably.
• A California-king-size mattress is a bit wider at 84 inches by 72 inches, there's plenty of room for couples (and pets!).

Comfort is entirely subjective, so there’s no one-size-fits all answer.

• Foam mattresses mold to the curves of your body to provide a customized level of support. This can help distribute body weight evenly, alleviating pressure points and reducing discomfort.
• Innerspring mattresses feature a sturdy yet responsive network of coils for extra support, ideal for stomach and back sleepers.
• Hybrid mattresses combine the benefits of foam with innerspring for a balance of support, responsiveness and pressure relief.

While there's no fixed timeframe for when you should replace your mattress, there are signs that indicate it might be time for a new one.

• Age: As a general guideline, most mattresses tend to last about 7-10 years; however, this can vary based on the type of mattress.
• Sagging or uneven surface: If your mattress has developed noticeable indentations or sags, especially in the areas where you regularly sleep, it can lead to discomfort and poor sleep quality.
• Waking up tired or achy: If you consistently wake up feeling tired, stiff or with pains, your mattress might not be providing the necessary support.
• Allergies or asthma symptoms: Over time, mattresses can accumulate allergens. If you notice an increase in allergy or asthma symptoms, or if your mattress has a strange odor, it might be time to replace your mattress.
• Changes in lifestyle or body needs: If you’ve had significant changes in your lifestyle, health or body weight, your mattress needs may have changed, too.
• Partner disturbance: If you share your bed with a partner and you're frequently disturbed by their movements during the night, it could be a sign that your mattress is no longer providing adequate motion isolation.

Generally, all foam, latex and any other non-innerspring mattresses will work well with adjustable bases. If you have an innerspring mattress with individually pocketed coils, it could be compatible as well.

Your favorite sleeping position can shed a little light onto your best kind of mattress. Of course, test out each one to find the comfiest mattress for you.

• Back sleepers can benefit from a medium-firm to firm mattress that provides support to the natural curvature of the spine. Foam, latex and hybrid mattresses can be good choices for back sleepers.
• Side sleepers typically need a mattress that offers good contouring to relieve pressure on the shoulders and hips. Foam and softer hybrid mattresses with sufficient cushioning can help maintain proper spinal alignment.
• Stomach sleepers often need a firmer mattress to prevent the lower back from sinking too much. An innerspring or firm hybrid mattress with good support is crucial to maintain a more neutral spine position.
• If you switch between different sleeping positions, a medium-firm mattress that strikes a balance between support and comfort might be right for you. Hybrid mattresses, which combine the support of innerspring coils with the comfort of foam or latex, is a great choice.
• If you frequently change your sleeping position or prefer to customize your sleeping experience, an adjustable base allows you to elevate the head and/or foot of the bed to find a comfortable position.