Hey - has your mum tried "Restavit"? It's an over the counter sleep drug here in down under. It does make you drowsy in the day though I find. But you could try a tiny dose. We also have it here as a combination OTC: paracetamol codeine doxylamine succinate. The other thing I use for sleep is Travel calm - the stuff for sea sickness, but make sure you don't get the one with caffeine in it (even though that's the one I use to put me to sleep because I use zopiclone during the day).
I'm 29 and I've been taking 7.5 tablets of zopiclone for several years, it's been a MIRACLE drug.
I was depressed/ had severe c-PTSD from age 8-21, tried to kill myself several times, one of which I survived by mere chance which traumatises me to this day.
My long term stress led me to a chronic pain disorder (fibromyalgia, sciatica and lots of muscular-skeletal pain not just in the joints but just about everywhere), and severe leg craps at night, despite having no organic cause that any xray/ MRI/ bone scan/ blood test etc could find.
I was prescribed Zopicone 7.5mg for insomnia due to leg cramps but it soon stopped working. For about 5 years the combination of 2.5mg Endone (Oxycodone) and 7.5 zopiclone helped my pain like nothing else. It also gave me an amazing amount of motivation, energy, confidence and belief in myself.
Two years ago I moved house and I had a relapse, developed chronic fatigue, job problems, etc.. and yeah I pretty much have a drug problem now, but I'm trying to control it so I can keep taking around 3-4 tablets a day which my doc know about. I've tried every anti-depressant, anti-psychotic, nerve pain drug, benzos, and a million vitamins- you name it, I've tried it. Imovane and my very expensive physio = life is good.
Point being, if someone told me it would reduce my life expectancy by 10 or 20 years... I'm not sure I wouldn't still be worth it.