4 month old sleep schedule
Four months is when sleep usually stops being simple. Your baby's sleep cycles mature into adult-like stages, which means they now surface fully between cycles instead of drifting through them. That is the real mechanism behind the so-called four month regression — it is a permanent change in how your baby sleeps, not a phase that reverses.
A 4 months sleep schedule, hour by hour
Built from the same scheduling engine Dormeli uses to generate real plans. Treat the times as a shape to adapt, not a script — your baby's wake time moves everything else.
| Time | What happens | Detail |
|---|---|---|
| 6:45 AM | Wake for the day | Start the clock here — the rest of the day is timed from this point. |
| 8:00 AM | Nap 1 | 1 hr 10 min · 1 hr 15 min awake beforehand |
| 10:40 AM | Nap 2 | 1 hr 10 min · 1 hr 30 min awake beforehand |
| 1:30 PM | Nap 3 | 1 hr 10 min · 1 hr 40 min awake beforehand |
| 4:30 PM | Nap 4 | 30 min · 1 hr 50 min awake beforehand |
| 7:00 PM | Bedtime | 2 hours awake after the last nap |
Wake windows at 4 months
At four months, most babies manage 90 minutes to 2 hours 20 minutes awake between sleeps. The windows are not equal across the day: the first one after morning wake-up is the shortest, and the final stretch before bed is the longest.
This shape matters more than the exact numbers. A baby who gets the same wake window all day tends to be undertired in the morning and badly overtired by bedtime, which is a common reason bedtime suddenly becomes a fight.
What the 4 month regression actually is
Before about four months, babies move between light and deep sleep in a fairly undifferentiated way. Around this age, sleep architecture matures and they begin cycling through distinct stages, arriving at a brief full waking roughly every 45 minutes during naps and every couple of hours overnight.
Every baby surfaces between cycles. The question is only whether they can get themselves back down. If your baby has always been fully asleep before being put down, there is no learned route back to sleep at that surfacing point — so they call for you.
This is why the regression does not simply end. What changes is your baby developing a way back to sleep, either on their own or with a consistent response from you.
Short naps are normal at this age
A 35 to 45 minute nap is exactly one sleep cycle. At four months, a large share of babies wake at that boundary and cannot yet bridge into a second cycle. This is developmentally ordinary and not a sign that anything has gone wrong.
The first nap of the day is usually the one that consolidates first, because sleep pressure is highest and the drive back into a second cycle is strongest. If you are going to invest effort anywhere, invest it there.
Bedtime and night sleep
Most four month olds do best with bedtime between 6:30 and 7:30 PM, timed by the last wake window rather than by the clock. If the final nap ends late, bedtime shifts later; if it ends early, a slightly earlier bedtime protects against overtiredness.
Night feeds are still developmentally appropriate at four months. One to three overnight feeds is a normal range, and there is no need to eliminate them on a schedule.
Every schedule here is a starting point
Wake windows are age-typical, but your baby is not typical — they have their own nap lengths, their own bedtime drift, and their own hard nights. Dormeli builds the schedule around the baby you actually have, then adjusts it as their naps change.
4 months sleep questions
How many naps should a 4 month old take?
Most 4 month olds take 3 to 4 naps a day, totalling around 4 hours of daytime sleep. Four naps is common when naps are short; three is typical once naps begin to lengthen.
What are wake windows for a 4 month old?
Roughly 1.5 to 2.5 hours, growing through the day. The first wake window after morning waking is the shortest at about 90 minutes, and the final window before bedtime is the longest at around 2 hours 20 minutes.
How long does the 4 month sleep regression last?
It is not a temporary phase that reverses. Sleep cycles mature permanently around this age. What improves is your baby learning a route back to sleep between cycles, which typically takes a few weeks of consistent response.
Why does my 4 month old only nap for 30 minutes?
A 30 to 45 minute nap is one complete sleep cycle. At this age many babies wake fully at that boundary and cannot yet link into a second cycle. It is developmentally normal and usually resolves first on the morning nap.