Numerous people deal with sleeplessness, perhaps better known as insomnia. The cause of insomnia can be attributed to a myriad of reasons, including stress or sleeping on a mattress that is ultimately not providing the comfort the body needs to fall into REM sleep, which is considered the deepest stage of sleep. Mattresses that are too firm, too soft, or use materials that do not allow the body to breathe properly can all contribute to a less than restful night's sleep.