Look at your full day to identify the causes of insomnia, not just the hours before you go to bed.
For example, setting too many meetings or not permitting yourself to take a break can leave you too wound up to fall asleep later at night. Instead, schedule your most intense work in the morning, and do more mundane tasks in the afternoon.
What works for you may only be discovered with trial and error.
For example, one can use smart mattresses, apps like Headspace, or fenugreek seeds. A mixture of nutmeg, cinnamon, and fennel boiled in water contains flavonoids and antioxidants that help calm the body. Mindfulness meditation can help aim your focus on the moment-by-moment experiences, thoughts, and emotions instead of thinking of the past or daydreaming.
I've struggled with insomnia nearly all of my adult life. Typically, I'm able to fall asleep within an hour or two, but often it takes much longer, and the anxiety about not sleeping has made it so much worse. I've accepted that this is something I just have to live with.
8 hours of sleep/night is a useful goal, but it’s not true that everyone needs that.
A lot of people get obsessed with this goal of getting 8 hours of sleep every single night, and because they’re someone who just doesn’t need that much sleep, or they can’t reliably sleep that long, they get anxious about it and that actually creates issues with insomnia.
Sleep deprivation takes a sharp toll on the human brain and body, impairing cognition, motor ability, and mood. Willpower, memory, judgement, and attention all suffer. You drop and bump into things, crave sugar, overeat, and gain weight. You're more irritable, more anxious, overly negative, and more emotionally reactive.