Sleep hygeine is a very important part of maintaining good sleep cycles. As mentioned above, cutting down on caffeine and alcohol are good first steps. Turning out the lights even before it's time to sleep can also help.

Benzadiazapines like restoril may be good for short-term use against insomnia, but should not be used long term, as dependence can develop. A good treatment for poor sleep habits in people over 65 is melatonin. Studies have shown that the pineal gland, which produces melatonin, produces less as we age. Melatonin is the major hormone that regulates out sleep/wake cycle. The most effective dose has been found to be 0.3mg, though the more common 3mg has also been shown to be effective. It is an over-the-counter supplement, and should be taken at least 1/2 hour before going to sleep.

A psychiatrist should examine her and rule out a major depression and mood disorders ( bipolar affective disorder). I have found that when we talk about the treatment of insomnia, we do not focus enough attention on dietary changes and life style changes.
A good sleep hygiene, with no light or sound disturbance, is essential. A good morning meditation and exercise program ( even if it means a little walk) is essential in dealing with the day's stresses. The day's activities should be organized and focused. A counsellor/psycho-therapist may be beneficial for the person and possibly the family. I have found out that one person's sleep problem, usually affects the whole house-hold.
A small bowl of oats in the evening is a good, cheap sleep aid. Potatoes tend to encourage sleep Guavas are a mild sleep aid.
A life style coach may be beneficial. We may be doing too many un- focussed activities during the day and our expectations are not being met.
Yoga and accupuncture may be helpful. Try alternative medicine and herbal treatments. I have found that persons tend to become too dependent on benzodiapines and sleep medicines.