Just when bedtime begins to feel predictable, your almost-one-year-old starts waking at midnight, standing in the cot, or resisting a nap that used to be easy. These 12 month sleep changes can be exhausting, especially when you thought unsettled nights were behind you.
Parents often call this the 12 month sleep regression. It describes disrupted sleep around the first birthday, not a medical diagnosis or a stage every child must experience. The useful question is what has changed and which adjustment might help.
What does the 12 month sleep regression look like?
Twelve month regression signs often appear after a settled stretch. Your child may take longer to fall asleep, wake more frequently overnight, cry when you leave the room, or start the day unusually early. Daytime naps might shorten or become a daily negotiation.
You might also find your baby pulling to stand in the cot instead of lying down. One difficult night alone does not establish a pattern. Look at several days of sleep, daytime mood and health before assuming a schedule problem.
Why sleep can change around the first birthday
New skills make bedtime more interesting
Pulling up, cruising, taking steps and experimenting with sounds can occupy a young child’s attention. Some babies practise new movements when they should be settling. Give supervised opportunities to move during the day, then keep bedtime pleasantly uneventful.
Separation anxiety becomes more noticeable
At this age, a child may understand that you have left without feeling confident about when you will return. That can make bedtime goodbyes harder and night waking more emotional. A reassuring, consistent response is more useful than treating crying as deliberate misbehaviour.
Discomfort and everyday changes matter too
Teething discomfort, a cold, an ear infection, travel or starting childcare can disturb sleep. So can a late nap or hectic evening. Several reasons may overlap, and fever or signs of pain should not be dismissed as a regression.
Is your baby ready to move from two naps to one?
The nap transition is often the most confusing part of one year sleep. A child who refuses the afternoon nap for two days may seem ready for one midday sleep. Yet many babies still need two naps at twelve months; moving to one commonly happens later, around fifteen to eighteen months, although timing varies.
Before removing a nap, ask whether the morning nap is running too late, the second nap is offered before your child is tired, or recent disruptions have changed the usual rhythm. A missed nap during a busy week does not necessarily mean the two-nap schedule has stopped working.
More persuasive signs of readiness are a repeated, sustained refusal of one nap, comfortable longer stretches awake, and a reasonably happy child who gets enough total sleep. If skipping the second nap brings late-afternoon tears and more night waking, the change may be premature.
For more detail on timing and readiness, a guide to two-to-one nap transitions can help explain why this shift is gradual rather than automatic on a birthday.
What a practical two-nap day might look like
Imagine a twelve-month-old who wakes at 7 a.m., naps from 9:45 to 10:45 a.m., then again from 2 to 3 p.m., with bedtime around 7:30 p.m. This is an example, not a prescription. If the first nap runs until noon, the second may become difficult because there is less room for it.
Rather than dropping a nap overnight, try keeping morning sleep reasonably consistent and allowing adequate awake time before the afternoon nap. Adjust in small increments, watching whether bedtime and daytime mood improve. If your child genuinely transitions to one nap, an earlier bedtime may help temporarily.
The American Academy of Sleep Medicine recommends 11 to 14 hours of total sleep in 24 hours for children aged one to two, including naps. Individual needs vary. A flexible one-year-old sleep schedule should reflect the whole day, not an arbitrary bedtime target.
Gentle ways to handle unsettled nights
Keep a short, recognisable bedtime routine
A wash, pyjamas, a quiet story, a cuddle and lights out in roughly the same order can help your child recognise that sleep is next. Aim for a calm wind-down rather than extra stimulation because they seem energetic.
Respond consistently without ignoring discomfort
When your baby calls out, check for illness, pain, hunger or a practical need first. If they are well, offer reassuring comfort in a way that fits your family’s approach. You can remain responsive while keeping nighttime different from playtime: dim lights, little conversation and no exciting activities.
Make standing in the cot less of a battle
Practise getting from standing back to sitting during supervised daytime play. At night, calmly help your child settle if needed. Keep the cot mattress at the appropriate low setting and the sleep space free from loose pillows, bumpers and other hazards.
Change one variable at a time
If you simultaneously cut a nap, move bedtime and change how you respond to waking, it becomes difficult to tell what helped. Keep a sleep diary for several days: waking time, naps, bedtime, nighttime waking and any illness. Look for patterns instead of chasing a perfect night.
When to ask for extra help
Sleep disruption has no guaranteed finish date. Some families notice improvement after a short unsettled period, while others need to adjust routines or address a separate problem. Contact your child’s healthcare professional if poor sleep persists, your baby seems unusually distressed, or you are worried about growth, feeding or development.
Seek medical advice for symptoms such as fever, significant ear pain, breathing concerns or persistent loud snoring. A guide to common baby sleep disruptions may help you recognise routine changes, but it cannot replace a medical assessment.
Frequently asked questions
How long does the 12 month sleep regression last?
There is no reliable fixed duration because the term describes various sleep changes rather than a defined illness. Track what is happening and reassess the routine if disrupted sleep continues instead of waiting for a promised end date.
Should I switch to one nap at twelve months?
Not automatically. Many children still do well with two naps at their first birthday. Consider a transition only when the pattern consistently suggests readiness and your child can remain rested throughout the day.
Why does my one-year-old cry when I leave at bedtime?
Separation anxiety can become stronger around this age. Predictable goodbyes, affectionate reassurance and a consistent settling routine can help. Sudden, intense crying accompanied by signs of illness deserves closer attention.
Can teething cause frequent night waking?
Teething discomfort may disturb some nights, but it should not be blamed for prolonged or severe symptoms. If pain seems significant, ask your child’s clinician about appropriate relief and rule out other causes.
A steadier routine, not a perfect schedule
The first birthday brings fresh skills, stronger preferences and sometimes messier sleep. Check for discomfort, observe naps over several days and offer reassurance. Resist rushing a nap transition because of one rough week. Small adjustments usually tell you more than a dramatic overhaul, while leaving room for your child’s individual needs.