"What time should bedtime be?" is the most-asked sleep question in pediatrician inboxes, and it has the most slippery answer: it depends. It depends on your child's age, their morning wake-up, what their naps did today, and what their tired cues are telling you tonight. Once you have a workable method, you stop chasing the number and start reading the signal.
Healthbooq gives you practical sleep-scheduling support that adapts to your family, not the other way round.
Step 1: Start with Age-Based Guidelines
Use these as a sensible range to start from. They assume a morning wake-up between roughly 6:30 and 7:30 a.m.:
- 3 to 6 months: 19:00 to 20:30
- 6 to 12 months: 18:30 to 20:00
- 12 to 24 months: 19:00 to 20:30
- 2 to 5 years: 19:00 to 21:00
Most healthy children in these age ranges fall asleep within 15 to 20 minutes of being put down at the right time. If yours doesn't, the bedtime is probably wrong rather than the child being unusual.
Step 2: Calculate from the Last Nap
The most reliable way to land bedtime is to work forward from the end of the last nap, using the age-appropriate final wake window:
- Note when the last nap ended
- Add the final wake window for the child's age
- That is the target bedtime
Worked example: 10-month-old, second nap ends at 15:00, age-appropriate final wake window roughly 3 to 3.5 hours. Target bedtime: 18:00 to 18:30.
The final wake window is usually slightly longer than the wake windows earlier in the day, because sleep pressure has accumulated and the homeostatic system is doing more of the work.
Step 3: Adjust for What the Day Actually Did
Today's nap doesn't always cooperate. Adjust bedtime to fit:
- Short nap (under 30 minutes for an infant, under an hour for a toddler): move bedtime 20 to 30 minutes earlier
- Skipped nap entirely: move bedtime 30 to 45 minutes earlier
- Long or late nap (especially one that ended after 16:00 in toddlers): you may need to move bedtime 15 to 30 minutes later, because sleep pressure won't be there yet
This is not "rewarding bad napping" — it is recognising that the right bedtime depends on cumulative tiredness, not the wall clock.
Step 4: Read the Tired Cues
The final calibration is done with your eyes, not your spreadsheet:
Too early. Bright eyes, playful, fighting the cot, takes 30+ minutes to settle. The child is not actually tired yet.
About right. The first tired cues — eye rubbing, dropped activity level, ear pulling, brief stares into space, slight pulling at sleep cues — show up 15 to 30 minutes before bedtime. The child settles within 15 to 20 minutes once down.
Too late. "Second wind." Wired, hyperactive, irritable, takes 30 to 45 minutes to settle even though they look exhausted. This is overtired bedtime — cortisol has kicked back in, and you are now fighting both the child and their hormones.
A child who consistently takes more than 30 minutes to settle, or has a meltdown at the start of the routine every night, is almost always being put to bed at the wrong time — usually too late.
Step 5: Adjust Gradually
If you've concluded the bedtime is off, move it 15 minutes every 2 to 3 days, not all at once. The circadian system adapts incrementally — give it the small step, hold for 2 nights, then judge. A single big shift produces noisy results and you can't tell what the system actually wanted.
Hold whatever new time you land on for at least a week before deciding whether it's working. Don't compare a Tuesday with a 30-minute walk in the park to a Sunday with grandparents and a long car nap. Look at the average shape of the week.
Key Takeaways
There is no universal 'right bedtime' — but there is one for your child this month, and you find it by working backwards from morning wake-up using age-appropriate wake windows. Aim for bedtime to land 15 to 30 minutes after the first tired cue. Adjust by 15 minutes at a time, every 2 to 3 days, and judge by how settling actually goes — not by the number on the clock.
