Just by getting a new mattress you can improve your sleep. If you wake up tired and achy the time has come for a new mattress. Whether you choose to sleep on a futon or traditional mattress set, you need something comfortable and supportive. There are a variety of mattresses available today from which to choose. Innerspring mattresses are still the most popular. They have been around since the first half of the 1900s but have changed dramatically over the years in how they are made. Six to eight inches use to be the standard height. Today it's common to find toppers like, memory foam, latex or other pillow top like materials that add 5-6 inches making the mattresses 12-16 inches. Because basic springs are not comfortable to sleep on these other materials add comfort but makes them really tall.
The reason more customers are moving to other types of mattress materials is simple. They are more comfortable. Memory foams and gel foams give a wonderful, supportive, motion free way to sleep. Latex and air mattresses also offer a new feel with excellent support. If two people sleep together no motion transfer makes a comfortable bed. You simply cannot feel the other person move.
If you toss and turn all night or have aches and pains due to arthritis like conditions then the newer materials should give you better comfort and less pressure points to interfere with your sleep. Memory foam and gel foam conforms to your body weight, shape and temperature. This makes for a more restive and relaxing night's sleep.
BUYING TIPS FOR THE RIGHT MATTRESS
1. Replicate your sleeping position at home when trying out a bed
2. Bring your own favorite pillow to try out with the new mattress
3. Spend at least 10-15 minutes on your selection
4. Make sure you don't have any pressure points (should feel like you are on air)
5. Is there enough room for you to move comfortably (especially for couples)
6. Mattress should give you the proper body alignment and not be to soft or too firm
7. Wear comfortable clothing so you can actually feel the mattress
Mattresses do wear out after a period of time depending on usage and how well the mattress was made to begin with. Most give the best support for about 8-9 years. Mattresses still could be feeling comfortable but not giving enough support any more. And if you have changed your living arrangements you need to change you bed.
SIGNS OF WEAR AND TEAR ON YOUR MATTRESS
No longer comfortable
Visible signs of wear like springs popping out
Rips or tears along seams
Waking up with a stiff neck or back consistently
Large indentations where you sleep or on edges
Not sleeping well on a nightly basis
If you've determined that it is time for you to look for a new mattress keep these things in mind. Before you go shopping make sure to do your homework on different types of mattress. They all have their plus and minuses. Decide on your size and price range. Go prepared, dressed properly, and take your pillow. 
Happy Shopping!
