(We have one post-puberty teenager and two other kids) ... our experience is that this does depend on whether you let your kids keep their phones and tablets in their bedrooms.
As many adults will confirm, going to sleep sure is easier without distractions.
Yes, you can probably distract someone into not sleeping who would be sleeping well otherwise. Most people however will struggle with sleeping at unnatural hours regardless of any distractions, and may use their phones and tablets in their bedrooms in hopes to help themselves fall asleep earlier.
Source: I was a teen once in an era without smartphones. Turns out lights out at 10pm didn't help me sleep at all, I just tossed and turned for a few hours until my body said it was time to sleep.