Can You Train Yourself to Wake Up Without an Alarm? A Dialogue — [DontSnooze](https://dontsnooze.io)
A sleep researcher and a productivity writer disagree about alarms. The conversation covers anticipatory cortisol, pre-industrial biphasic sleep, and whether deleting the alarm app is wisdom or wishful thinking.
The following is a constructed dialogue between two perspectives on alarm use — one grounded in sleep physiology, one in behavioral pragmatism. Neither is a strawman. Both positions have evidence behind them.
Productivity Writer: I’ve been reading about pre-industrial sleep patterns — Roger Ekirch’s research on segmented sleep — and it made me wonder whether the alarm clock itself is part of what makes mornings feel violent. Like, maybe we’re not supposed to be woken by an external signal at all.
Sleep Researcher: Ekirch’s work is genuinely interesting, but I’d push back on the inference. He documented biphasic sleep patterns in pre-industrial Europe — people sleeping in two segments with a waking period in the middle of the night — not alarm-free waking. The absence of alarm clocks in 1650 doesn’t mean people woke at optimal times. It means they woke when sunlight came through a window, or a rooster crowed, or a neighbor made noise. Those are also external signals. They’re just less precise ones.
PW: But there’s something to the cortisol awakening response, right? The body actually prepares for waking. Your cortisol rises before you’re conscious. Doesn’t that suggest the body has its own timing?
SR: It does, and the cortisol awakening response is real and well-characterized. What it shows is that once your circadian clock has anchored to a specific wake time, the body begins preparing for that wake time 20 to 30 minutes before it occurs. Cortisol rises, body temperature increases, sleep becomes lighter. But this is the system learning from experience — it prepares for waking because you’ve woken consistently at that time before. It’s downstream of the consistent schedule, not independent of it.
PW: So the argument for alarms is partly circular? You need an alarm to establish the consistent time that eventually makes the alarm unnecessary?
SR: Mostly, yes. Some people with very strong circadian rhythms — typically early chronotypes, people who have kept consistent schedules for years — do wake reliably without alarms. But “reliable” here means within a 15 to 20 minute window, not at a precise time. And it requires years of consistent prior anchoring. For most people in most circumstances, “I’ll just wake naturally” means waking at whatever time results from the previous night’s sleep duration and quality, which can vary substantially.
PW: What about the evidence on sleep inertia — the grogginess? There’s research suggesting you feel worse when woken by an alarm during deep sleep than when you surface naturally. Doesn’t that suggest natural waking produces better outcomes?
SR: Yes, conditionally. Waking from slow-wave sleep produces significantly worse sleep inertia than waking from light sleep or REM. Natural waking tends to occur at the end of a sleep cycle, when sleep is naturally lighter, which is why natural waking often feels cleaner. But this is an argument for consistent, sufficient sleep duration and for alarms calibrated to sleep cycle timing — not necessarily for alarm-free waking. The apps that claim to wake you in your lightest sleep phase are working with this insight, with mixed results in practice.
PW: Let me ask the harder question. Is there any evidence that the population of people who sleep without alarms — by choice, not because they’re chronically sleep-deprived — has better outcomes?
SR: That’s actually a hard question to study cleanly, because alarm use correlates with occupational constraints (people who can afford to sleep without alarms often have more flexible schedules) and those correlates are themselves associated with better health outcomes. The confounders are significant. What I can say is that the theoretical case for alarm-free waking is strongest for people who have very consistent schedules, sleep adequate hours, and have a chronotype that matches their social obligations. For most working adults, that’s not the situation.
PW: So who should delete the alarm app?
SR: Someone who wakes within 10 minutes of the same time every day without an alarm, over at least three weeks of observation. Someone who consistently gets seven to nine hours of sleep and wakes feeling genuinely rested. Someone whose social and professional obligations don’t require precision waking — they don’t have a 7 a.m. meeting that genuinely costs them something if they arrive at 7:20. For context, waking up at the same time every day describes what that state actually feels like to build toward — the 30-day experience and what shifts.
PW: That’s a short list.
SR: It’s a very short list. The rest of us are using alarms because we have to, and the question isn’t whether to use one but how to use one in a way that minimizes the friction. Which is a different question.
PW: The more I read about this, the more it seems like the real argument isn’t alarm versus no alarm — it’s external accountability versus internal regulation. And most people need external regulation more than they think they do.
SR: For morning timing, yes. The circadian system is robust, but it’s not autonomous in the way people want it to be. It needs inputs. It needs consistency. An alarm is an input. The problem with most alarm use isn’t the alarm — it’s the multiple alarms, the willingness to dismiss the alarm and negotiate with yourself, the inconsistency in when it’s set. The people who “don’t need” alarms have essentially internalized a very consistent alarm by keeping the schedule so reliably that their physiology has adapted to it. That’s not alarm-free waking. That’s very good alarm discipline.
PW: Which is a longer way of saying: the alarm isn’t the enemy.
SR: No. The inconsistency is the enemy. The alarm is a tool for enforcing consistency. A better tool for most people than whatever internal motivation they’re relying on instead.
Frequently Asked Questions
Can you really train yourself to wake up without an alarm? Yes, under specific conditions. People who maintain extremely consistent wake times over months to years — typically those with strong early chronotypes and stable schedules — do develop reliable natural waking within a 15 to 20 minute window. The cortisol awakening response prepares the body for waking at the expected time. But this is downstream of prior consistency, not independent of it: natural waking without prior alarm use typically produces variable wake times determined by sleep duration and quality on a given night.
What is the cortisol awakening response? The cortisol awakening response (CAR) is a sharp rise in cortisol levels — typically 50 to 100 percent above baseline — in the 20 to 30 minutes immediately following waking. It is driven by the HPA axis and serves as the body’s alerting signal, supporting the transition from sleep to wakefulness. The CAR is stronger in people with consistent sleep schedules, higher with earlier chronotypes, and associated with better morning alertness. It is also the physiological basis for the experience of “waking up before my alarm” after an established consistent schedule.
What was Roger Ekirch’s research on pre-industrial sleep? Roger Ekirch, a historian at Virginia Tech, documented through analysis of historical records — diaries, medical texts, court documents — that before the industrial era, many Europeans slept in two segments: a “first sleep” from nightfall until roughly midnight, a waking period of one to two hours, and a “second sleep” until dawn. His work, published in At Day’s Close: Night in Times Past (2005) and summarized in a 2001 American Historical Review article, established that biphasic sleep may have been historically common. The waking period between sleep segments was often used for prayer, reading, conversation, or sex. Ekirch’s work doesn’t specifically address alarm use — pre-industrial people were woken by light, sound, and social schedules, not internal timing alone.
Does waking with an alarm actually make you feel worse than waking naturally? Waking from slow-wave sleep — which is heavier and produces higher sleep inertia — does produce more grogginess than waking from light sleep or REM. Natural waking tends to occur at the end of a sleep cycle during a lighter phase, which is why it often feels cleaner. An alarm set at a fixed time may occasionally fire during deep sleep depending on the preceding sleep duration and quality. This is an argument for consistent sleep timing (which places the alarm more reliably at cycle ends) rather than for abandoning the alarm.
What does “chronotype” have to do with natural waking? Chronotype — the individual variation in the timing of sleep and waking preference — determines when the body’s circadian drive toward wakefulness peaks. Strong early chronotypes (people whose circadian clock naturally drives earlier wake times) are the most likely to wake reliably without an alarm because their internal clock phase-advances into the social schedule. Strong late chronotypes forced into early schedules have the opposite experience: their circadian wakefulness window doesn’t coincide with their alarm time, making both alarm-prompted and natural waking difficult at that hour. Chronotype science covers the biology in detail.