One of the most disorienting things about newborn life is the gap between "babies sleep a lot" (true — 14–17 hours per day) and how that actually feels. Exhausting. Unpredictable. Relentless. The reason: newborn sleep comes in fragments, scattered across day and night without any circadian rhythm.
Understanding what's developmentally normal — and tracking your specific baby's pattern — helps you distinguish "this is hard but normal" from "something here might need attention."
Weeks 1–2: the newborn stage
Total sleep: 14–18 hours per day. Wake windows of just 45–60 minutes — by the time you've finished a feed and had a brief alert period, sleep time may already be approaching. Night/day confusion is completely normal; circadian rhythm hasn't developed yet.
Weeks 3–4
Total sleep: 14–17 hours. Wake windows extending slightly to 60–75 minutes. Many babies go through a fussy period in the evenings around weeks 3–6 (often peaking at 6 weeks). This is developmentally normal, not a sleep problem to fix.
Weeks 5–8
Total sleep: 14–16 hours. Slightly longer stretches at night begin to appear — 3–4 hours is possible. Wake windows reach 75–90 minutes. This is when you can begin gentle circadian cues: bright light and activity during daytime windows, dim and quiet during nights.
Weeks 9–12 (3 months)
Total sleep: 13–15 hours. Many babies are capable of a 4–6 hour stretch at night, though this varies enormously by individual. Wake windows grow to 90 minutes. Day naps may still total 4–5 per day.
Why tracking matters in the newborn stage
When you're sleep-deprived, each day blurs into the next. You know "last night was bad" but you can't recall whether Tuesday or Wednesday was worse, or whether night stretches are getting longer at all. A sleep log gives you something that survives the haze.
Specifically, tracking reveals:
- Whether night stretches are gradually lengthening (reassuring) or stuck (worth discussing with your paediatrician)
- Your baby's actual wake windows — which helps you time naps before overtiredness sets in
- Total sleep over 24 hours — which often reveals your baby is sleeping more than it feels like
- Patterns in feeding times and fussy periods that aren't visible day-to-day
The wake window principle
One of the most useful concepts in newborn sleep is the wake window: how long a baby can comfortably stay awake before becoming overtired. Overtired babies are paradoxically harder to settle — cortisol spikes make falling asleep more difficult, not easier.
In the newborn stage, wake windows are very short. By the time a feed is finished and there's been 10 minutes of interaction, it may already be time for sleep cues. Tracking wake windows in real time — logging sleep start and end — shows you exactly how long your baby's windows actually are.
Using a sleep tracker
Lullwise is built for real-time tracking. Log sleep start and end with one tap, and Lullwise automatically shows today's total sleep, your current wake window, and how this compares to typical benchmarks for your baby's age. Over time, patterns emerge that help you anticipate your baby's needs rather than react to them.