Insommnia

Hi
my friend is suffering from insommnia, often she will get one or 2 hours a night sometimes nothting at all. She has recently suffered a nervous breakdown and is taking antidepressants for anxiety attacks. She is extremely fit and works as a fitness instructor. She was previously in a highly demanding managerial role within the fitness centre on top of teaching classes. Due to the breakdown she has stopped the managerial side of the job and is just teaching which she really enjoys. She has never been one to get alot of sleep, averaging about 6-7 hours as a norm. However when the anxiety and extreme stress caused the breakdown the insommnia started. Everything else has improved with the change of job and the anti depressants but the insommnia still stands. She has very bad asthma which is controlled well usually. She takes a minimum dosage of ventalin and becotide. I know she has tried off the peg 'Holland and Barrett' tupe homeopathic remedies and had no success.
The only thing that has actually worked is nytol which she doesn't want to keep taking as she wants natural not chemical sleep. She is pre disposed to excema and has a few food allergies which cause her asthma to flair up. She has asthma worsened by contact with horses, cats, dogs, dust and other common respiratory triggers.
She is trying to keep calm about the lack of sleep but i know it is starting to become a problem for her.

Any help would be greatly appreciated.

Lex