One of the best ways to get to sleep is to create a sleep routine and stick to it every single night, even on the weekends. My partner was having messed up sleep and I threatened him to either create a sleep routine or go to the doctor. He did, and now he sleeps so much better. Not only did he create a routine, but there was stuff like no more screen time right before bed, keeping the room cool and ventilated (turning down the temp and using a fan), and a bunch of other stuff.
How to Sleep Better: Tips for Getting a Good Night’s Sleep
This site basically runs down all the tips about what to do to sleep better. It's not worth it for me to type it all out here, they do a great job of it. They mention getting as much sunlight as possible, and using a light box, especially in winter. If you can't get out for, oh, an hour a day in bright sunshine, like during lunchtime, then you might want to use it in summer too. The one my partner uses is really excellent. Everyone I know who I've recommended it to with either insomnia or mild to moderate seasonal affective disorder has had fantastic results using it it without needing medication if they make other changes as well.
The light box is not cheap but it should last many years.
Amazon.com: Philips goLITE BLU Light Therapy Device: Health & Personal Care The more basic version of this without the timer is 40 bucks cheaper
Amazon.com: Philips Hf3321 goLITE BLU: Health & Personal Care
WARNING: DO NOT use the lightbox if you have bipolar disorder. It can trigger mania, use it only under a doctor's knowledge and help.
If people are wondering why you should limit the amount of light from screens before bed and get more light during the day, it has to do with regulating your light/dark cycles which helps you fall asleep faster and get better sleep.
The site even has advice on what to do if you wake up during the night and can't sleep again or if you can't get to sleep, how to manage it in ways without making you more awake. It's really the best site I've seen in a long time about improving your sleep.