18 Month Sleep Regression and How to Get Your Toddler Sleeping Again

Bedtime used to be easy. Now your toddler says “no” to pajamas, asks for one more book, then another, then cries the second you leave the room. Some nights they wake at 2 a.m. and won’t settle unless you stay. Naps have become a battle too. The 18 month sleep regression has a reputation as one of the toughest, and for good reason. It isn’t about a baby’s sleep cycles anymore. It’s about a toddler who suddenly has big feelings, strong opinions, sore gums and a growing need to be close to you, all at the same time. The good news is that it usually passes within a few weeks, especially if you stay calm and consistent. Here’s why it happens, the signs, how long it lasts and what helps most.

Is There an 18 Month Sleep Regression?

It isn’t a medical diagnosis, and some toddlers sail through. Still, many families notice a clear dip in sleep somewhere between about 17 and 19 months, often after months of good nights. It’s one of the most common times parents report bedtime battles and new night wakings. Unlike the 4 month regression, nothing changes in how your child’s brain cycles through sleep. Instead, several big developmental changes tend to land at once.

Why Does the 18 Month Sleep Regression Happen?

A Push for Independence

Around 18 months, toddlers discover they’re separate people with their own wants. “No” becomes a favorite word, and bedtime is the perfect place to test it. Stalling, asking for more books, refusing to lie down and protesting every step of the routine are all part of this healthy, if exhausting, stage.

Separation Anxiety Comes Back

Separation anxiety often returns for a while at this age. Your toddler understands more about the world, including that you leave at night, and they may cry or call for you to stay until they fall asleep, or wake up and want you back.

Teething

Many toddlers are cutting canine teeth around now. According to the American Dental Association’s tooth eruption chart, the canines usually come in somewhere between about 16 and 23 months, and the first molars a little earlier. Sore gums can mean a few rough nights around each tooth.

Big Feelings, Few Words

At 18 months, most toddlers understand far more than they can say. That gap leads to frustration, and frustration often shows up at bedtime as tears and tantrums.

Nap Changes

Most toddlers move from two naps to one somewhere between about 14 and 18 months. If your child has recently dropped a nap, or is in the middle of switching, they may be overtired by bedtime. Our 14 month sleep regression guide covers how the nap change can upset sleep, and our guide on when babies drop to one nap explains the transition in detail.

18 Month Sleep Regression Signs

• Fighting bedtime, stalling, or asking for “one more” again and again
• Crying when you leave the room, or wanting you to stay until they fall asleep
• New night wakings after sleeping through
• Nap refusal or shorter naps
• Waking very early
• Climbing, or trying to climb, out of the crib
• More tantrums and clinginess during the day

18 Month Sleep Regression Night Waking

Night wakings at this age are often about wanting you, not hunger. A toddler who wakes and only settles when you stay, pat or lie nearby has usually come to rely on that help. Short, calm, consistent check-ins tend to work better than staying until they’re asleep every time.

How Long Does the 18 Month Sleep Regression Last?

Usually 2 to 6 weeks. Teething disruptions tend to last only a few days around each tooth. Separation anxiety and boundary testing can last longer, especially if new habits form, like a parent lying down in the room every night. Being consistent is what shortens it.

Is the 18 Month Sleep Regression the Worst?

Many parents say so, often because toddlers are louder, stronger and more stubborn than babies, and because it can arrive just when sleep finally felt settled. Others find the 4 month regression harder. Our hub on baby sleep regression ages compares them all.

How to Handle the 18 Month Sleep Regression

Keep a Predictable Bedtime Routine

Toddlers resist less when they know exactly what comes next. Keep the same steps in the same order every night, such as bath, pajamas, teeth, two books, cuddle, song and lights out. A simple picture chart of the routine can help.

Offer Small Choices, Not Big Ones

Your toddler wants control, so give some. “Do you want the dinosaur pajamas or the striped ones?” “Should we read this book or that one?” Small choices meet that need without opening bedtime up for negotiation.

Set Clear, Kind Limits

Decide in advance how many books, how many songs and how many sips of water, then stick to it. When your toddler asks for more, a calm “It’s bedtime now, we’ll read more tomorrow” said the same way every night works better than a long debate.

Respond the Same Way at Night

When your toddler wakes and calls for you, keep it short and boring. Go in, reassure them with the same phrase, settle them and leave. If you’ve been staying until they fall asleep, fade it slowly, for example by sitting a little closer to the door each night.

Should You Let an 18 Month Old Cry It Out?

Some families use sleep training at this age, including methods with timed check-ins or cry it out, and parents in Reddit sleep training threads often say a short “retrain” worked within a few nights. Others prefer gentler, slower methods. Both can work if you’re consistent. Make sure your toddler is healthy and not in pain from teething, and talk to your pediatrician first if you’re unsure.

Check the Schedule

Toddlers aged 1 to 2 usually need about 11 to 14 hours of total sleep in 24 hours, including naps, according to guidance endorsed by the AAP. Most 18-month-olds take one nap of about 2 to 3 hours and do well with about 5 hours or more of awake time before bed. If bedtime keeps turning into a battle, your toddler may not be tired enough yet. If they’re melting down by late afternoon, an earlier bedtime for a while can help.

Give Extra Connection During the Day

Some one-on-one time before bed, even 10 minutes of floor play with your full attention, can make separation at bedtime easier.

What If My Toddler Climbs Out of the Crib?

Climbing out is common around this age, and it’s a safety issue. Make sure the crib mattress is at its lowest setting and that there’s nothing in the crib to stand on, like large toys or bumpers. A sleep sack can make climbing harder. Safety guidance says to move a child out of the crib once they’re about 35 inches tall or can climb out. If your toddler keeps climbing out, it may be time to think about a toddler bed. Our guide to toddler beds covers the switch. Try to avoid moving to a bed in the middle of the regression just to end the bedtime fight, since many toddlers find a bed even harder to stay in.

Can My 18 Month Old Have a Blanket, Pillow or Lovey Now?

Yes. After 12 months, a small, thin blanket and a soft lovey are generally considered fine, and many toddlers find them comforting during separation anxiety. A flat toddler pillow can come later. Our guide on when babies can sleep with a blanket covers how to introduce them safely.

Is My Toddler Having Nightmares?

Some toddlers may start having bad dreams around this age, though night terrors are more common later. If your child wakes crying and is easy to comfort, a quick cuddle and your usual phrase is usually enough. Our guide on whether newborns can have bad dreams explains when nightmares and night terrors usually begin and how they differ.

When to Call Your Pediatrician

Call your doctor if poor sleep comes with fever, ear pain, persistent cough, vomiting, snoring or pauses in breathing, or if sleep problems last more than about 6 weeks. Also talk to your doctor if your toddler isn’t walking, isn’t using a few words, or has lost skills they had before.

This article is for general information only. Every child is different, and it can’t replace advice from a doctor who has examined your child. If you’re worried about your toddler, contact your pediatrician or emergency services right away.