😴 Diagnose the Sleep Problem
Four quick questions. Top 3 most likely causes for tonight, with fixes. Built for use at 2 AM.
How this tool actually helps
Five quick steps. Most parents can complete this in under 2 minutes even at 2 AM.
- 1Pick your baby's age
Different ages have different normal sleep patterns and likely causes. We adjust the diagnosis based on developmental stage.
- 2Choose the main problem
Won't fall asleep, frequent waking, waking too early, short naps, or crying in sleep. Pick the one that fits best. You can also pick More Than One if multiple apply.
- 3Tick the symptoms you see
Multi-select. Pulling ears, drooling, red face, kicking legs, etc. The more symptoms you tick, the more accurate the diagnosis.
- 4Add recent context
Anything that's changed lately. New tooth coming, missed nap, started daycare, moved house. These often hold the key.
- 5Click Diagnose
You get the top 3 most likely causes ranked by probability, with immediate fixes for tonight and prevention tips for tomorrow. We'll also flag any red flags that mean you should see a doctor.
I built the first version of this tool in my head at 3 AM when my 7-month-old was on his fifth wake-up. I had read four different blog posts and a WhatsApp forward. They all said different things. I just wanted someone to tell me what was MOST likely so I could try ONE thing. This tool is that. It is not magic. But it gets you to the most likely cause in under 2 minutes, with one thing to actually try. That is usually all a tired parent needs.
This tool is a triage guide for normal baby sleep issues based on common pediatric sleep knowledge. It is NOT a substitute for your GP. If your baby has a fever, breathing issues, lethargy, persistent vomiting, or you as a parent are not coping — the doctor wins, every time. The red flag banner in your result will tell you if a doctor visit is needed.
What's actually going on when your baby won't sleep
The biology behind those 2 AM meltdowns. Useful to understand even when you're too tired to read.
Wake windows by age — the single most useful number
If you remember one thing from this whole page, remember wake windows. The time baby is awake between sleeps. Too short, not tired enough. Too long, overtired (and ironically harder to settle).
| 0-3 months | 45-90 minutes |
| 4-5 months | 75-120 minutes |
| 6-8 months | 2-2.5 hours |
| 9-12 months | 2.5-3.5 hours |
| 13-18 months | 3.5-4.5 hours |
| 18-24 months | 4-6 hours |
| 2-3 years | 5-6 hours (1 nap day) |
The 4-month sleep regression — not a regression, a permanent change
The most misunderstood phase. Around 4 months, baby's sleep architecture changes permanently. Before 4 months, baby sleep is mostly deep with brief stirrings. After 4 months, baby sleep matures into adult-like cycles — light, deep, REM, repeat — with full awakenings every 45-90 minutes between cycles.
The change is biological and irreversible. Babies who used to drift back through cycle ends now WAKE UP fully at the end of each cycle. They need to learn to bridge these cycles — either by self-soothing back to sleep, or by getting help from a parent.
Sleep associations — how good intentions create night wakings
An association is whatever the baby is doing when they FALL ASLEEP. If you rock the baby until they're asleep then transfer to cot, the baby's brain learns "I sleep when being rocked." Then when they wake briefly between cycles (which happens every 45-90 min after 4 months), they look around and find themselves in a different situation than when they fell asleep. The brain says "WAIT, this is wrong" and the baby wakes fully, crying.
The fix is putting baby down DROWSY but AWAKE. They learn the cot itself is where sleep happens. Then between cycles, they wake briefly, see the same situation, and drift back to sleep without needing you.
Bedtime routine — signals matter more than time
A 20-30 minute bedtime routine, done the same way every night, signals to baby's brain that sleep is coming. The body starts producing melatonin in response. The routine ITSELF is the trigger, not the clock time.
The Australian summer problem — room temperature is huge
Optimal baby sleep room temperature is 22-24°C. Most Australian summer bedrooms without AC sit at 30-34°C through the night. That alone causes 60-70% of "mysterious" night wakings in Australian babies through April-October.
White noise — what it does and why it helps
The womb is LOUD. Roughly 70-80 decibels. Louder than most living rooms. Newborns are physiologically wired for noise during sleep. Silent rooms feel wrong to them. White noise (steady, low-frequency sound) mimics the womb environment and masks household sounds like doors opening.
Use a white noise machine, a fan on low, or a phone app (search "white noise sleep"). Continuous, not intermittent. Volume around the level of a shower running (50-65 dB), played throughout sleep.
Day sleep affects night sleep — how much, when, where
Counterintuitive truth: a well-napped baby sleeps BETTER at night, not worse. Skipping naps to "tire them out" backfires almost every time. The body produces cortisol when sleep-deprived, which keeps them wired and awake.
When sleep issues mean a doctor visit
Most sleep problems are normal, age-appropriate, and resolve with time. But sometimes they signal something medical. Red flags below need a GP check, not a calculator.
Australian sleep myths, gently set straight
Things tired parents actually ask
My baby cries the moment I put her in the cot. What is the fastest thing to try?
How do I know if it is hunger or a sleep association?
Is letting my baby cry harmful?
My in-laws says my baby is hungry every time she cries. Is she right?
What is the 4-month sleep regression and is it permanent?
Should I sleep train my baby? At what age?
What are wake windows and how do I use them?
Is co-sleeping safe?
How much sleep does my baby actually need?
When should I see a GP about sleep issues?
How baby sleep care actually works in Australia
Australian pediatric care runs through a mixed public-private system. Medicare covers GP visits and public ED visits. Many families also have private health insurance for faster specialist access. Your first call for after hours fever or illness is typically Healthdirect on 1800 022 222. Free, 24/7 nurse line. The Maternal and Child Health Nurse system is one of the best in the world. Free and accessible. Royal Childrens Hospital Melbourne, Westmead in Sydney, Queensland Childrens, Perth Childrens. These are the specialty ED centres for serious cases. For rural and remote families, telehealth through 13Health in Queensland or HealthDirect federally is critical. Royal Flying Doctor Service covers the genuinely remote stuff.
In Australia, call Healthdirect on 1800 022 222 for free 24/7 health advice. For emergencies, call 000. Maternal and Child Health Nurses (free in most states) help during business hours. Your GP is the first point of contact. The Tresillian Parent Helpline (1300 272 736) also handles concerns about babies.
What Australian mums actually deal with
Aussie mums tend to be pragmatic about baby illness. Cultural default leans toward "she will be right." Combined with reasonable access to nurses and GPs, this generally works. The Maternal and Child Health Nurse system is a treasure of the Australian health system. Use it without hesitation. Telehealth normalised during COVID and stayed normalised, which is genuinely useful. The unique Aussie concerns are bushfire smoke season and extreme summer heat. Babies are more vulnerable to air quality than adults. Sun and heat exposure can cause apparent fever via overheating. Always check core temperature properly (rectal or under-arm thermometer), not just the forehead, especially in summer.