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What time should I wake up if I go to bed at 6:00 pm?
Updated October 3, 2026 · Method: 15 min to fall asleep + 90-minute cycles · Sources: NINDS, AASM, NSF
Short answer
1:45 am
after 5 full cycles — 7 h 30 min of sleep, inside the 7–9 h most adults need.
General information from population studies (NIH, CDC, NSF, AASM). It is not medical advice and does not replace a clinician who knows you.
Going to bed at 6:00 pm is early for an adult, which is exactly why it pays off: five full cycles end at 1:45 am, six at 3:15 am, both well before most alarms.
One cycle ≈ 90 min (range 70–120) · NINDS · as of October 3, 2026
Why these alarm times
1:45 am is five cycles and 7 h 30 min; 3:15 am is six and 9 h. If the morning allows the later one, the extra cycle is mostly REM, the stage that gets squeezed on short nights. 12:15 am is the four-cycle minimum (6 h), below the 7-hour line the AASM and Sleep Research Society set for adults.
Waking at the end of a cycle usually means waking from light sleep or REM rather than deep sleep, which is why an alarm that lands here feels gentler than one that lands twenty minutes earlier. Cycles vary from 70 to 120 minutes, so each time is the centre of a window.
Walk through the night from a 6:00 pm lights-out: asleep by about 6:15 pm, into the first stretch of deep sleep around 6:35 pm, first REM period near 7:30 pm, the halfway point of the night at 10:00 pm, and the longest REM period of the night starting around 1:10 am — which is what a 1:45 am alarm at the end of cycle 5 lets you finish.
All alarm times for a 6:00 pm bedtime
| Alarm | Cycles | Sleep | Adult range |
|---|---|---|---|
| 12:15 am | 4 | 6 h | below 7 h |
| 1:45 am | 5 | 7 h 30 min | within 7–9 h |
| 3:15 am | 6 | 9 h | within 7–9 h |
| 4:45 am | 7 | 10 h 30 min | above 9 h |
Formula: alarm = bedtime + 15 min + (cycles × 90 min) · methodology
Who goes to bed at 6:00 pm: bakers, openers and 4 am starts
A 6:00 pm bedtime belongs to people whose work starts before the buses do. Six cycles end at 3:15 am, which suits a 4 am start at a bakery, a market or an airport; five cycles end at 1:45 am for a 2:30 or 3 am start. If you only need to be up at 5, the seven-cycle row, 4:45 am, is longer than most adults can sleep, and that is a sign 6:00 pm is earlier than you need: a 7:30 pm bedtime reaches the same alarm in six cycles.
The catch with any bedtime this early is falling asleep. The fifteen minutes built into these alarm times is an average for people going to bed at their usual hour. At 6:00 pm the body clock is still promoting wakefulness, and reviews of early-morning shift work find that people go to bed early, lie awake, and end up with a short night anyway. Three things shorten the wait: no caffeine after noon (the six-hour line), a room dark enough that a summer evening does not show, and the same bedtime on at least the nights before work. If you are regularly still awake at 7:00 pm, plan from that instead: asleep at 7:00 pm means five cycles end at 2:30 am, not 1:45 am, and the alarm that leaves you least groggy moves with it.
Every bedtime in the 6 pm hour
| Lights out | 4 cycles · 6 h | 5 cycles · 7 h 30 | 6 cycles · 9 h | Last coffee |
|---|---|---|---|---|
| 6:00 pm | 12:15 am | 1:45 am | 3:15 am | 12:00 pm |
| 6:15 pm | 12:30 am | 2:00 am | 3:30 am | 12:15 pm |
| 6:30 pm | 12:45 am | 2:15 am | 3:45 am | 12:30 pm |
| 6:45 pm | 1:00 am | 2:30 am | 4:00 am | 12:45 pm |
Alarm times for each bedtime · last coffee = six hours before lights out (Drake 2013) · methodology
Try a different bedtime
Sources
- Brain Basics: Understanding Sleep — National Institute of Neurological Disorders and Stroke (NIH)
- How Sleep Works - Sleep Phases and Stages — National Heart, Lung, and Blood Institute (NIH)
- Sleep cycles - Sleep Education — American Academy of Sleep Medicine
- Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the AASM and Sleep Research Society — Sleep 38(6):843-844, 2015
- Sleep inertia — Sleep Medicine Reviews 4(4):341-353, 2000 (Tassi P., Muzet A.)
- Shift work and disturbed sleep/wakefulness — Occupational Medicine 53(2):89-94, 2003 (Åkerstedt T.)
- Shift work and the assessment and management of shift work disorder (SWD) — Sleep Medicine Reviews 17(1):41-54, 2013 (Wright K.P., Bogan R.K., Wyatt J.K.)
- Impacts of shift work on sleep and circadian rhythms — Pathologie Biologie 62(5):292-301, 2014 (Boivin D.B., Boudreau P.)
- High risk of near-crash driving events following night-shift work — Proceedings of the National Academy of Sciences 113(1):176-181, 2016 (Lee M.L. et al.)
- Effects of napping on sleepiness and sleep-related performance deficits in night-shift workers: a systematic review — Biological Research for Nursing 16(2):134-142, 2014 (Ruggiero J.S., Redeker N.S.)
General information from population studies (NIH, CDC, NSF, AASM). It is not medical advice and does not replace a clinician who knows you.