Total Sleep (24 Hours)

Total Sleep = Nighttime Sleep + (Nap Duration × Number of Naps)

The sum of overnight sleep and all daytime naps. The AASM recommends 12–16 hours for 4–12 month olds, 11–14 hours for 1–2 year olds, and 10–13 hours for 3–5 year olds.

Wake Window Calculation

Wake Window = Time between end of one sleep period and start of the next

Wake windows grow with age: 45–90 min at 1 month, 1.5–2.5 hrs at 4–6 months, 2.5–3.5 hrs at 8–12 months, and 4–6 hrs at 18+ months. The first wake window of the day is typically the shortest.

Bedtime Calculation

Bedtime = Last Nap End + Final Wake Window

The ideal bedtime is determined by adding the age-appropriate final wake window to the end of the last nap. The final wake window is typically the longest of the day.

Nap Transition Timeline

5→4 naps: ~3 mo | 4→3: ~4 mo | 3→2: ~6–8 mo | 2→1: ~12–18 mo | 1→0: ~3–5 yr

Nap transitions happen at predictable developmental stages. Each transition temporarily disrupts the schedule and may require an earlier bedtime for 2–4 weeks.