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Screen Time is how iOS lets an app count phone use and lock apps. go to sleep asks for it once, with Face ID or your passcode. Without it, the app can't count or lock anything.

No. Screen Time only tells it that another minute of phone use has passed. It doesn't learn which apps or websites, or what was on the screen.

Time inside an app. The Lock Screen and the Home Screen don't count, so checking the time or glancing at a notification doesn't either.

Two things at once, like a video in picture in picture while you scroll, can make Screen Time count a minute twice. go to sleep never counts more minutes than actually passed.

No. It counts every night from 20:00 until noon and reads the night in the morning. Change the start under Count from in Settings. Tapping in bed makes that time exact; without it, in bed is estimated from when your last stretch of phone use began, and shows with a ~ in front.

Open go to sleep and hold the unlock button. At night that's an early unlock: the night isn't over and counting carries on, so you can lock again. From 05:00 it asks whether you're up for the day or just checking.

While the lock is on, iOS doesn't allow deleting apps, so the lock can't be skipped that way. It lifts with the lock.

iOS leaves some of Apple's own apps open, along with anything in Settings, Screen Time, Always Allowed. To lock another app that stays open, add it under Choose apps to always lock in go to sleep's settings.

It reads waking from when you used the phone and, if you turn motion on, from when the phone was carried. A pause of 45 minutes or more counts as sleep, and when a morning is unclear, a notification asks you. Your answer fixes that night.

Things it can't see read as sleep: lying awake without touching the phone, or getting up and leaving it behind.

On your iPhone, inside the app. Nothing is sent to LT3. Deleting the app deletes them. The privacy policy lists everything it keeps.

Turn off go to sleep's Screen Time access in iOS Settings, or delete the app.