Baby sleep cycles: what to expect and how to help

Newborn sleep cycles are an essential aspect of your baby’s development and can affect how rested both of you feel. Babies and infants have different sleep requirements from adults, and as many parents know, when their child doesn’t get enough sleep, they can be cranky and irritable. But don’t despair; there are many gentle ways to help your baby learn the difference between day and night and build a soothing bedtime routine as they grow.

Why do babies sleep so much?

Everyone knows how much of a struggle it can be when you haven’t had enough sleep, and for our little ones, those feelings are often intensified. As they grow so rapidly, sleep is essential for supporting their development, learning and memory.

How much sleep do babies need?

Understanding baby sleep patterns by age can help you know what to expect as your little one grows. Baby sleep needs vary from one baby to the next.

Newborns

Newborn babies will typically sleep around 14 to 17 hours a day, but this can realistically fluctuate from 11 to 13 hours or even 18 to 19 hours. Many newborns spend much of the day and night sleeping, usually in short bursts, and wake frequently for feeding.

Infants

From around 3 to 6 months, your baby may need fewer night feeds and may start sleeping for longer stretches. Some sleep for 5 to 8 hours or longer at night, though not all will. From around 6 to 12 months, some babies sleep through the night, although teething, hunger and changes in routine can still disrupt sleep.

Toddlers

After their first birthday, many toddlers sleep around 12 to 15 hours in total across the day and night.

How long is a baby sleep cycle?

A newborn’s sleep cycle length lasts about 45 to 60 minutes, moving between active and quieter sleep. During active sleep, they may twitch, stir, make noises or pull facial expressions. This is completely normal and doesn’t always mean they’re awake.

How infant sleep cycles differ from adult sleep cycles

Sleep requirements between infants and adults are remarkably different, and this is closely tied to your baby’s circadian rhythm, which is still developing in the early months. Unlike adults, babies do not usually sleep in one long block. Babies wake often for feeds, comfort, teething or because their sleep pattern is still developing.

As your baby grows, these smaller daytime naps turn into longer sleeps; they’ll need fewer night feeds, and they’ll gradually sleep for longer periods.

Do babies have REM sleep?

Yes. Rapid eye movement (REM) sleep, also known as active sleep, is characterised by high brain activity, rapid eye movements, and muscle twitching. During baby REM sleep, infants may display facial expressions and make noises. Infant active sleep is part of normal baby sleep and helps support rapid brain growth and early development.

When do babies’ sleep cycles lengthen?

Your baby’s sleep pattern changes gradually. In the early months, babies often sleep in short bursts, with frequent waking for feeds. From around 3 to 6 months, some babies start waking after longer stretches of sleep, but not all will. Growth spurts, teething and illness can also affect sleep, so routines may need to change as your baby grows.

Adults experience a sleep cycle that consists of four stages of non-REM sleep followed by a period of REM sleep. In contrast, infants do not have distinct stages of non-REM sleep.

When a baby is about three months of age, they start sleeping more like adults, moving through four distinct infant sleep stages with a distinct pattern of brain waves:

• Stage 1 (NREM 1): alpha waves and low-amplitude mixed-frequency activity
• Stage 2 (NREM 2): sleep spindles and K-complexes
• Stage 3 (NREM 3): delta waves
• Stage 4 (REM): alpha and beta waves.

When a child reaches five years old, the time they spend in each stage is closer to that of an adult.

Establishing healthy sleep habits for babies

Building sleep habits can take time, but a simple routine may help your baby settle as they grow.

1. Help your baby tell day from night: during the day, open the curtains and talk and play as usual. At night, keep lights low, use a quiet voice, change them only if needed, and avoid play, so your baby gradually learns that night-time is for sleeping
2. Set up a consistent bedtime routine: it can help signal to your baby that it’s time to sleep. This could include a bath, reading a book, and singing a lullaby
3. Create a sleep-friendly environment: ensure your baby’s sleep environment is cool, calm, dark, and quiet. If you use white noise, keep it low, place it away from your baby’s cot and do not rely on it as the only way to help your baby fall asleep
4. Encourage daytime naps: infants need a lot of sleep, so ensure they get enough rest during the day.
5. Be responsive to your baby’s needs: infants may wake up frequently at night, so be prepared to respond to their needs. This could mean feeding them, changing their nappy, or just comforting them
6. Avoid over-stimulation before bedtime: avoid activities that may over-stimulate your baby before bedtime, such as playing with toys that make noise or watching TV

Safe sleep basics

For every sleep, place your baby on their back in a clear, separate cot or Moses basket with a firm, flat mattress. For at least the first 6 months, your baby should sleep in the same room as you, day and night. Keep the cot clear of pillows, duvets, loose blankets, cot bumpers, soft toys, pods or nests, and keep the room at a comfortable temperature of around 16-20°C.

When to seek further support

Every baby is different, and sleep patterns can change as your baby grows. If you are concerned about your baby’s sleep, feeding routine, or overall development, or you need support getting into a routine, speak to your health visitor, GP, or healthcare professional

For more guidance and tips, explore the Capricare® Parent Support Hub.