hi sir/mam,i know how depressing insomnia is.many of my patients complain of tolerance with prolonged usage.flurazepam can be used in insomnia in dose of 15mg an hour before sleep. caution:you may experience dizziness or light headedness the next day.so careful while driving.it may also have addiction potential on prolonged usage. i often prescribe my patients, zolpidem.it induces sleep faster and helps you to stay asleep for long.of course it also has got the same adverse effects of residual sedation the next day and habit-forming potential on prolonged use.but 67% of my patients are satisfied and feel its worth it.it is available as ambien 5mg,10mg.you can go for a 5mg daily dosing.but both these are not on the counter medications and can be procured only with a prescription by a registered medical practicioner.hope my clarification is satisfactory.other health issues if any,please let me know.i m happy to assist you medically.thank you.take care.bye.