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About Sleep

To help your child to develop healthy sleep habits it is important to have some understanding of how we sleep and sleeping patterns.

Humans spend one-third of their life asleep. It is not known yet why we need so much sleep and what happens while we sleep, but we do know the consequences of sleep deprivation.

Sleep is extremely important for the brain and body to develop. And that is why it is so important to start healthy sleeping habits as early as possible.

Normal sleep phases

Active and quiet sleep

In active sleep, babies breathe irregularly and shallowly, twitch their arms and legs, and display rapid eye movements under closed lids. In fact, limb muscles become temporarily paralysed. Heart rate increases, and blood pressure rises.

In adolescence and the adult years, active sleep is called rapid eye movement (REM) sleep. Active sleep is a form of light sleep. It is believed that REM is the time when we process what we have experienced throughout the day. Scientist think that is why new borns spend most of their time asleep in REM sleep.

In quiet sleep, babies lie still and breathe deeply. They’ll occasionally jerk or ‘startle’. Quiet sleep is similar to non-REM sleep in older children and grown-ups. It can be light or deep.

Light and deep sleep

Light sleep can be very light – sometimes you might not even realise you’re asleep. We can be easily woken from light sleep.

Someone in deep sleep is hard to wake. Deep sleep is a lot more peaceful and restful. It’s thought that deep sleep is the time when we grow and heal. Someone in deep sleep might feel quite drowsy if woken.

Sleep cycles

In the course of one night, grown-ups and children move through repeating cycles of quiet and active sleep.

Typically, more of our sleep in the early part of the night is quiet sleep (about 80%). Then, about halfway through our normal-length sleep, our sleep cycle flips. By morning, about 80% of our sleep is active sleep.

This is why it’s easier to be disturbed towards the end of a sleep.

Sleep cycles in babies and children

Cycles of quiet and active sleep last 30-50 minutes in babies, then gradually increase in length across childhood.

Some babies and children fall deeply asleep very quickly. Others sleep lightly, fidgeting and muttering for up to 20 minutes, before getting into deep sleep.

Children usually wake briefly at the end of each sleep cycle. This is a normal part of healthy sleep – all children do it. Some children call out when they wake and need help settling again, but independent sleepers put themselves back to sleep. And that is why it so important to teach children to be independent sleepers.

An independent sleeper might take a few seconds or minutes to put themselves back to sleep giving them the chance to have a better quality sleep. A child who depends on props to go back to sleep will be wasting valuable time seeking the same conditions that put him to sleep in the first place such as feeding, rocking, pacifier.

Sleep cycles in adolescence and adulthood

In adolescence and during the adult years, each cycle of active and quiet sleep lasts about 90 minutes.

Each cycle ends in a brief awakening, and these can happen several times throughout the night. These awakenings don’t normally disrupt our sleep, and we usually aren’t even aware of them. If things haven’t changed, we’ll normally go straight back to sleep – but if things have changed around us, we’re uncomfortable or anxious, our pillow is missing, or we’re disturbed by a noise, we might wake fully.

How sleep cycles change over time

The amount of time we spend in each type of sleep varies depending on our age.

At birth, full-term infants spend about half their sleeping time in active sleep. Each sleep cycle lasts only 40 minutes (compared to 90 minutes for a grown-up). This means that, biologically, infants are programmed to sleep more lightly and have more awakenings than grown-ups.

The amount of active sleep in our sleep cycle decreases with age. By three years of age, 33% of sleep is active.

By the time we’re around 13 years old, only about 20% of our sleeping time is active sleep.

When we sleep

It takes time to consolidate most of our sleep into the night-time. Babies and children vary in their sleep habits and sleep requirements, just like adults. It can be a good idea to have routine sleep times to stop your child getting overtired or sleepy during the day – see what works best for your child.

Under six months

Newborns sleep on and off through the day and night.

Babies aged 3-6 months might start moving towards a pattern of 2-3 daytime sleeps of up to two hours each. They might still wake at least once at night.

From 6-12 months

From about six months, babies have their longest sleep at night.

Between six and 12 months, most babies are in bed between 6 pm and 10 pm (latest 8pm bedtime recommended). They usually take less than 30 minutes to get to sleep (but about 10% of babies take longer).

Most babies can sleep for a period of six hours or more at night and are waking less. About 60% will wake only once during the night and need a grown-up to settle them back to sleep. About one in 10 will call out 3-4 times a night. More than a third of parents report problems with their baby’s sleep at this age.

Around 85-90% of infants aged 6-12 months are still having daytime naps. These naps usually last 1-2 hours. Some infants will sleep longer, but up to a quarter nap for less than an hour.

From 12 months

From this age, children tend to sleep better. Some toddlers start to resist going to sleep at night, preferring to stay up with the family – this is the most common sleep problem reported by parents. It peaks around 18 months and improves with age.

Less than 5% of two-year-olds wake three or more times overnight.

From 3 years

Children aged 3-5 years need around 11-13 hours of sleep a night. Some might also have a day nap that lasts for about an hour.

Children aged 6-9 need 10-11 hours sleep a night. They’re usually tired after school and might look forward to bedtime from about 7.30 pm.

From 10 years

Children entering puberty generally need about 9¼ hours of sleep a night to maintain the best level of alertness during the day.

Changes to the internal body clock or circadian rhythm during adolescence means it’s normal for teenagers to want to go to bed later at night – often around 11 pm or later – then get up later in the morning.

Over 90% of adolescent children don’t get the recommended amount of sleep on school nights. Getting enough good-quality sleep is important during this period, because sleep is vital for thinking, learning and concentration skills.

Parents can help children get enough sleep by encouraging a set bed time on school nights, then allowing kids to stay up a bit later on the weekends. To prevent Monday morning blues and early week tiredness, it can be a good idea for teenagers not to get up too late on weekends.

Reference

Raising Children. (2013, February 27). About Sleep. Retrieved http://raisingchildren.net.au/articles/sleep_the_hows_and_whys.html/context/731