Phalaeo,
Hey there

.
Until people get treated, we recommend they sleep as inclined as possible. It is a gravity thing, the more horizontal you are, the more gravity collapses the throat tissue. Therefore, many people sleep in a recliner.
As far as generally avioding the other person's movements, has anyone tried a Tempurpedic? You know, the one where they jump up and down on the bed and don't spill over a glass of wine. I was on a bed where they had bought just a layer of that kind of material to go over the regular mattress. It is a lot cheaper than buying a whole Tempurpedic. My friend said he bought the top at one of those bulk discount stores for around $130 and it wasn't a Termpurpedic, but it was heavenly. I got the same thing for my daughter's bed at one of those bed and bath stores.
NancyL/mtnplayva
If your spouses are being 100% compliant with their CPAP and their CPAP is correcting their apneas, then they are probably twitching because they have PLMD and that disorders needs to be addressed because it also disrupts sleep. Here is my cut and paste on PLMD:
There are two main kinds of limb movement during sleep. During an apneic event, there is limb movement due to futile attempts to breath. As apnea is compensated with the use of CPAP, the effort to breath is eliminated and the limb movement decreases.
Periodic Limb Movement Disorder (PLMD) is the sleeping cousin to the awake Restless Legs Syndrome (RLS) and these are both neurological disorders. There is a circadian cycle to RLS/PLMD which is why the symptoms of RLS are worse at night. Not all people with RLS have PLMD and visa versa. You can have one and not the other. I happen to have both. With RLS/PLMD, the calmer the body is, the worse the symptoms are. Since these are neurological disorders they must be treated with medication. The common first line drugs of choice are low dose anti-Parkinson’s drugs such as Requip or Mirapex. Second line drugs are benzodiazepines such as Klonopin, but these drugs are addictive. Additionally, anemia exacerbates PLMD/RLS so that needs to be ruled out. I don’t know if this is applicable to others, but drinking alcohol also exacerbates my RLS/PLMD.
PLMD is itself very disruptive to sleep. In my case, I was first treated for OSA and a few years later, when I started becoming fatigued again, a sleep study showed PLMD. I had known quite awhile I had RLS since that is a awake/conscious disorder.
A sleep study with CPAP rules out whether the limb movement is due to the effort to breath or PLMD. Not only does CPAP eliminate the movement if it is effort related, but this movement is always linked to an apneic event whereas PLMD is random movement.
You can find more information here:
Restlessless Legs Syndrome Foundation
Vicki
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Being defeated is often a temporary condition. Giving up is what makes it permanent.
Marilyn Von Savant
That which does not kill you makes you stronger-Friedrich Nietzsche
Friedrich must of had apnea.