Sleeping pills or taking any other pills for anxiety is not a solution for anybody.
We have to have some kind of good solutions for mental health. Like doing exercise, healthy food habits, no caffeine or sugar after 4 p.m.
Teens always keep their cell phones near the pillow.
I think they don’t want to miss any kind of alert.
They always updated with every kind of like or videos.
Some parents give them charger also to charge their phone. In case they all out of battery.
Some kids use their phone to check the time. This habit can put their brain for heavy work mode.
The workload brain never stops working even they sleep.
The teen should engage in some kind of relaxed activities after 8 p.m.
Such as reading a book, yoga etc.
Even over‑the‑counter remedies like melatonin, “PM” analgesics like “Advil PM,” or diphenhydramine (generic Benadryl), can be inappropriate for young people. Studies evaluating efficacy and safety of these medications were never intended to evaluate efficacy and safety in children.

Turning off phones- not pills- the key to better sleep for teens. According to Anne Mason’s psychiatric-mental health nurse practitioner,” I’ve got 15‑ to 17‑year‑olds coming into the clinic reporting they can’t sleep at night,” said Mason, who’s also director of the Washington State University College of Nursing’s Doctor of Nursing Practice (DNP) degree program. “These young men and woman are describing sleep interruptions not typically seen until late adulthood.”
Prescription sleep medications can have serious side effects including addiction, daytime sleepiness, depression, memory loss and nighttime behaviors such as sleep-walking, sleep-eating, and even sleep-driving.

If the teen doesn’t like to talk with anybody that’s fine. They can do some Yoga or read a book, or go and do fresh air walk, drink some Elephant drink.

https://www.elephantjournal.com/2012/07/drink-this-sleep-like-a-baby/

https://news.wsu.edu/2018/11/29/turning-off-phones-key-to-teen-sleep/

https://lifespa.com/drink-this-and-sleep-like-a-baby-its-delicious/