Based on the text below, answer question
Additional Factors That Affect Sleep Comfort.
By Richard A. Staehler, MD
The type of mattress one uses is not the only factor for patients with pain and sleep difficulty. Many other factors need to be considered that may affect sleep, including:
- medication side effects;
- irregular sleep patterns;
- caffeine/alcohol/tobacco use;
- sleep apnea;
- anxiety/stress.
If comfort isnot the only thing making sleep difficult, it is advisable for the patient to consult his or her family physician to discuss other possible causes and treatments for sleeplessness.
If anyone experiences significant or persistent back pain, there may be an underlying back condition that has nothing to do with the mattress. It is always advisable for people with back pain to consult with a health care provider for a thorough exam, diagnosis, and treatment program.
As a reminder, sleep comfort às first and foremost a matter of personal preference. No one should expect that switching mattresses or beds will cure their lower back pain, and changes ∈ the type of bed or mattress used should be made solely for the sake of comfort.
(Adapted from http://www.spine-health.com/wellness/sleep/additional- factors-affect-sleep-comfort)
Considering the text, the word "solely" ∈ "[...] changes ∈ the type of bed or mattress used should be made solely for the sake of comfort." means
