Cynthia,
I'm sorry for your pain and sudden progression. Sounds like you need a Hoyer-type lift now for transfers. Your local ALSA chapter may have a loaner, or you can buy one w/ cash or using insurance. We would all recommend a powered rather than hydraulic one, though sometimes insurance will make you pay the difference, unless your caregiver is physically-impaired. Not sure what you have now, but a shower/commode chair will also help if you don't have one.
Hope,
Everyone sleeps differently, as you know, but with a foam overlay, a heated mattress pad and a head-elevated/back tilted/legs elevated bed position, my husband is so far able to sleep through the night on his back [w/ BiPAP, admittedly, which I realize you don't want] w/o repositioning despite pre-existing reasons for pain like herniated disks and dural ectasia, which ALS obviously doesn't help. To try to keep his hips, which were also previously diseased, aligned at night, we use a large foam belt just below and around both kneecaps, that normally is used for wheelchair positioning (plus pressure relief boots and small pillows under the knees, of course). Maybe that could help you.
Best,
Laurie