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In bed by 11 PM? Set the alarm for 6:45 AM Form SC-8

No lecture about going to bed earlier. You're up till 11; that's the given. Count forward five 90-minute cycles from lights-out plus 15 minutes to drift off and the sweet spot is 6:45 AM. The night owl gets a schedule that works with the habit, not against it.

Tool № 8 · Saturday, September 26, 2026 · free, always

The night-owl reverse. No judgment, just arithmetic.

Input slip · Form SC-8

Pre-filled for an 11:00 PM lights-out: the ledger posts the wake-up times below the tear line. Change the bedtime and it re-counts instantly.

Reads your device clock once and rounds down to the nearest 5 minutes. Tap again any time to re-check.

Posted entry · Form SC-8-R

WAKE AT 6:45 AMForm SC-8

Going to bed at ~11:00 PM → asleep by ~11:15 PM. Tomorrow morning, assuming you fall asleep ~15 minutes after you lie down.

  • 4 cycles5:15 AM6h 15m in bedthe minimum, don’t make it a habit
  • 5 cycles6:45 AM7h 45m in bed the sweet spot for most people
  • 6 cycles8:15 AM9h 15m in bedthe full monty
What about 3 cycles?

Wake at 3:45 AM: 4h 45m in bed, roughly four and a half hours of actual sleep. Emergency minimum, not a plan.

My wake-up ledger — Form SC-8
In bed: 11:00 PM → wake at 6:45 AM (5 cycles, ~7h 45m in bed)
Earlier: 5:15 AM (4 cycles) · Full rest: 8:15 AM (6 cycles)
Rule of thumb, not medical advice. microtoolsdaily.com/bedtime-at-11pm/

A rule of thumb, not medical advice. This calculator uses average sleep-cycle lengths to estimate good bedtimes. It doesn’t know you, can’t diagnose anything, and doesn’t promise how you’ll feel. If sleep is a real problem, talk to a doctor — not a ledger.

How the math works Form SC-8

Start at 11:00 PM, add 15 minutes to fall asleep, then stack 90-minute cycles forward: four ends at 5:15 AM, five at 6:45 AM, six at 8:15 AM. Each listed time is a cycle boundary, the moment one full cycle completes, so the alarm interrupts as little deep sleep as possible.

Cycles aren't a perfect 90 minutes for everyone; they're an average with real wobble, which is why the page offers three landings instead of one. Type your actual bedtime above if 11 was aspirational; the count re-anchors to whenever you really drift off.

Common questions Form SC-8

If I go to bed at 11 PM, what time should I wake up?

6:45 AM. That's five 90-minute cycles after an 11:00 PM lights-out, plus 15 minutes to fall asleep, the sweet spot this page stamps. Need up earlier? 5:15 AM completes four cycles. Sleeping in? 8:15 AM is the full six.

Is 6:45 AM the best wake time for an 11 PM bedtime?

It's the best-balanced one: five complete cycles, about seven and a half hours asleep, alarm landing between cycles. 5:15 AM is the honest minimum and 8:15 AM is the full rest. The page shows all three because the right answer depends on what your morning demands.

I fall asleep later than 11: does the math still work?

Yes, just anchor it to reality: the cycles start when you drift off, not when you lie down. If you're actually asleep around 11:40, add 40 minutes to each wake time on this page (6:45 becomes 7:25). Or type your real bedtime into the calculator above and let it re-count.

Can I use this if I wake up in the middle of the night?

You can restart the count. If you're up at 3 AM and fall back asleep around 3:20, three more cycles puts a reasonable alarm at about 8:05. It's triage, not planning. But counting forward from when you actually fall back asleep beats picking a round number and hoping.

Is 6 hours (4 cycles) enough from 11 PM?

As the occasional short night, it's fine; that's what the 5:15 AM row is for. As the routine, it isn't: six hours a night accumulates a deficit that one long weekend doesn't repay. If 5:15 is your life rather than your exception, the bedtime needs to move, not the alarm.

Also in the ledger Form SC-8