cause one: overtired at bedtime
Counterintuitively, a bedtime that lands too late, or too little day sleep, often produces an early wake-up. The overtired body clock lurches, and the last stretch of the night, which is the lightest sleep, is where it shows up. If your baby is fighting bedtime and then waking at 5, this is the likely one, and the fix runs through earlier, better-timed sleep during the day and evening.
cause two: the body clock has drifted early
The other version is a genuine clock problem, where the internal day has simply shifted so that 5am reads as morning. This one is often paired with a baby who wakes cheerful and ready, not distressed. The fixes here are about light, timing, and not accidentally rewarding the early start.
the thing that holds either way
Pick a morning start time and hold it. If you go in at 4:45 and start the day, feed, lights, chatter, you are teaching the clock that 4:45 is when the day begins, and it obliges. Which of the two causes you are dealing with changes the rest of the plan, and telling them apart usually needs your baby's age and where bedtime actually lands, which is exactly the kind of thing I sort out with a family.
Anything that looks like early hunger tied to growth or feeding is a pediatrician conversation first.
quick answers
Why does my baby wake up at 5am?
Two opposite causes: being overtired at bedtime, or the body clock drifting so 5am reads as morning. A distressed early waker is often overtired; a cheerful one often has a clock issue.
Is 5am a night waking or morning?
Hold a consistent morning start time and treat anything before it as night. Starting the day at 4:45 teaches the clock that the day begins then.
How do I fix early morning waking?
It depends which cause you have, so the first step is telling them apart by age and bedtime timing. A consistent morning start time helps either way.
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