Bedtime calculator
Enter your child's age, this morning's wake time, and the time their last nap ended — get tonight's ideal bedtime instantly.
The wake window from nap end to bedtime is appropriate for 9 months. Aim for 18:00–18:30.
Methodology grounded in paediatric sleep research and evidence-based clinical practice. Schedule data, wake window recommendations, and regression timelines are derived from published guidelines including those of the American Academy of Sleep Medicine (AASM), the National Sleep Foundation, and paediatric sleep research published in peer-reviewed journals.
Read our full methodology →Bedtime by age: quick reference
Most children do best with a bedtime between 18:30 and 20:00. The exact time depends on when they wake and when their last nap ends — use the calculator above for tonight, or this table as a starting point.
| Age | Bedtime window | Naps | Total sleep (24h) |
|---|---|---|---|
| 4 months | 18:00–20:00 | 4 | 12–16 h |
| 5 months | 18:00–19:30 | 3 | 12–15 h |
| 6 months | 18:00–19:30 | 3 | 12–16 h |
| 7 months | 18:00–19:30 | 2 | 12–15 h |
| 8 months | 18:00–19:30 | 2 | 12–15 h |
| 9 months | 18:00–19:30 | 2 | 12–15 h |
| 10 months | 18:00–19:30 | 2 | 11–14 h |
| 11 months | 18:30–19:30 | 2 | 11–14 h |
| 12 months (1 year) | 18:30–19:30 | 2 | 11–14 h |
| 15 months | 18:30–19:30 | 1 | 11–14 h |
| 18 months | 18:30–19:30 | 1 | 11–14 h |
| 2 years | 19:00–20:00 | 1 | 11–14 h |
| 3 years | 19:00–20:00 | none | 10–13 h |
| 4 years | 19:00–20:30 | none | 10–13 h |
| 5 years | 19:30–20:30 | none | 10–13 h |
How we calculate this: total-sleep ranges follow the American Academy of Sleep Medicine consensus (endorsed by the AAP); bedtime windows combine those ranges with typical wake windows for each age. Educational guidance, not medical advice.
Bedtime questions parents ask
What time should a 1-year-old go to bed?
Usually between 18:30 and 19:30. If the afternoon nap ends after 15:30, aim for the later end of that window.
Is 8pm too late for a toddler's bedtime?
Not necessarily. If your toddler wakes around 7:30, still naps and falls asleep within 20 minutes, 20:00 can work. If they wake at 6:00 or fight bedtime, try moving it 15 minutes earlier every few nights.
Does an earlier bedtime stop 5am wake-ups?
Often, yes — early waking is frequently a sign of overtiredness. A bedtime that is too late can make mornings earlier, not later.
How long before bedtime should the last nap end?
Roughly one wake window: about 3–4 hours at 12 months and 4–5 hours for toddlers on one nap.
The numbers are the easy part
A calculator tells you when tonight's bedtime should be. It cannot tell you why last night fell apart, or what to change first. A Lunio plan is built from your child's age, current routine and the specific problem you are having — and you can start it tonight.