About a year ago, my sister & her husband bought a new pillow-topped, king-sized mattress. At the time, and for several months thereafter, they were both happy with it. However, several months ago, my sister started to have problems sleeping: she found the mattress too soft, and it started causing her some back pain. She has a history of migraines, and the discomfort she's having with the mattress is causing sleep-loss & muscle tension, which is now increasing both the severity & frequency of her migraine attacks...
They have a 10-month-old child, and they just bought a house 5 months ago, so they're not in any position to spend another thousand dollars to buy a new mattress, so I'm looking for possible solutions (temporary or long-term).
They tried putting a board between the mattress & the box spring, but it didn't help because the problem seems to be the pillow top on the mattress itself. Any ideas?