How to cure Insomnia if sleeping pills don’t work? But not using natural herbal remedies?

What happens if ya have insomnia and you don’t know what the cause is? If sleeping tablets don’t work what would be next? Could anxiety or depression cause insomnia?

insomnia ?

i have a problem thats been going on since january i wake up every 3 hrs after a dream i always remember atleast 2 to 4 dreams a night i usally sleep about 5-7 hours but with 2 awakenings at night is this insomnia?
i have been to my doctor and they did some lab everything [...]