I just read horrible reviews on the Sleep Number Earl. Have your parents check under the bed for mold. One couple said when they moved and took the bed apart it was covered in mold. Apparently the company has been in the news for recalls, motor issues and about the mold.
We just bought a bed from another site, a self adjusting technology (SAT) bed for both Jim and I. This bed recycles the air from the outside in and no motor is required like the Sleep Number beds. As you turn or move the bed adjusts to your body weight. We also bought the adjustable frame that has the massage features Sleep Number has. The main reason I bought this bed is the zero gravity it has to prevent bed sores and such.
Here is the web site if anyone is interested. The NMSS endorses the bed as does the BBB and medical field. It is regulated by the medical government whereas the Sleep Number isn't. It also cost cheaper than a Sleep Number. The king size split Jim and I were looking at with Sleep Number was going to be over $7000. This one was $5700 with delivery, no taxes, and a 12 month no payments/no interest financing plan.
SAT Bed They also have a 90 day try it out policy. I'll let you know how it sleeps when we get it in three weeks.