The specific problem at bedtime is that it's the one part of the day with the least remaining willpower and the highest remaining temptation — after a full day of decisions, resisting "just one more thing" in bed is genuinely harder than it would be at 9am, and the phone is right there on the nightstand, already in hand from setting an alarm a moment before. There's also a well-documented mechanism worth naming plainly: screens emit blue light that can suppress melatonin production, which is part of why sleep guidance consistently recommends winding down without a bright screen — though the behavioral habit of losing track of time scrolling is, for most people, at least as large a factor in lost sleep as the light itself.
What you've probably already tried
Charging the phone outside the bedroom, a built-in Bedtime or Wind Down mode, a physical alarm clock to remove the need for the phone at all. Bedtime mode in particular has real evidence behind a piece of it — it typically switches the display to grayscale, and grayscale specifically has been shown in several studies to reduce screen time, though the same research finds it does little to stop the first pickup, only how long you linger once you're in. Some people also try a strict digital sunset — no screens at all after a set time — which works well when followed but tends to be one of the first rules abandoned on a tired night, precisely because "just this once" feels low-stakes in the moment and only adds up to a real problem over many repeated nights. Some people also use a dedicated, non-phone alarm clock specifically to remove the last remaining legitimate reason to have the phone within reach at bedtime at all, which sidesteps the problem more completely than any in-app tool can. A cheap analog alarm clock solves this particular problem more completely than any app-level setting ever could.
Why generic blocking advice fails specifically here
"Just don't bring your phone to bed" is good advice that a lot of people already know and still don't follow, because the phone often serves a legitimate function right up to the edge of sleep — the alarm — which means "leave it in another room" requires solving the alarm clock problem too, and most people don't bother. It's also worth noting that Bedtime mode's grayscale switch is the piece of it with the strongest research behind an actual effect — reduced time once you're in an app — while the broader promise of "better sleep" from the mode overall is less consistently supported, which is a useful, more modest way to think about what it's actually doing. It's also worth noting that light exposure earlier in the evening, not just right before bed, affects sleep readiness, so a blocker used only in the final ten minutes addresses a smaller part of the picture than one used from an hour or two out. Even twenty extra minutes of buffer before sleep tends to produce a disproportionately noticeable improvement.
The honest fit
A quiz-gated block fits well here specifically for the apps that turn "setting an alarm" into an hour of scrolling — the phone stays in the room for its legitimate job, but the specific distracting apps that eat into sleep get the friction, right at the exact moment willpower is lowest and the temptation is highest. It's a narrow fix for a specific, common failure point — not a general sleep-hygiene solution — but for the specific pattern of losing thirty or sixty minutes to a distracting app right before sleep, it directly targets the exact moment where that time disappears. It's most effective when it starts before the point exhaustion typically sets in, since willpower to resist the phone is already at its lowest by the time most people actually notice they should be asleep. Starting the wind-down earlier, even by twenty minutes, tends to produce a disproportionately better result.
Where it isn't the right fit
If the underlying issue is genuine insomnia or a sleep disorder, not just phone habits, blocking apps addresses only one contributing factor among several, and it's worth talking to a doctor if difficulty sleeping is persistent — a blocker can protect the last half hour before bed, it can't fix a medical sleep problem underneath it. Sleep hygiene more broadly — consistent wake times, a dark and cool room, limiting caffeine later in the day — matters at least as much, and a blocker works best as one piece of that broader picture, not a replacement for it. A consistent wind-down routine — dimming lights, a fixed pre-sleep ritual — tends to reinforce whatever the blocker is doing rather than working against it. None of this needs to be perfect every night to still meaningfully improve average sleep over a month. None of this needs to be followed perfectly every night to still meaningfully help on average.