[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Behavioral science](https://durgical.com/en/behavioral-science/) › [Normal sleep](https://durgical.com/en/behavioral-science/areas/sleep/) › Normal sleep across the life span

# Normal sleep across the life span

- Concept

Newborns sleep most of the day with half of it in REM; deep sleep peaks in childhood and fades with age, and older adults wake more often.

Updated Nov 5, 2026

## Key points

- Newborns: about half of sleep is REM (active sleep), they may enter sleep through REM, and sleep is spread across day and night.
- Slow-wave (N3) sleep is highest in early childhood, drops sharply in adolescence and keeps declining; some older adults have almost none.
- Older adults: less N3, more N1, more frequent awakenings, lower sleep efficiency, more daytime napping and an earlier (advanced) circadian phase.
- Adolescents: a later (delayed) circadian phase plus early school times cause chronic sleep restriction.
- Total sleep need falls with age, but older adults do not need much less than younger adults; poor sleep is not an inevitable part of ageing.

## What it is

How long, when and how deeply people sleep changes predictably with age. Newborns sleep in short bouts around the clock with a large share of REM (active) sleep; children have the most deep N3 sleep; adolescents shift their clock later; and older adults sleep more lightly, with less N3, more awakenings and an earlier bedtime. Knowing the normal pattern prevents treating normal ageing as insomnia and helps spot true disorders.

## Recommended sleep and typical sleep pattern by age (recommendations: CDC)

| Age group | Recommended per 24 hours | Typical pattern |
| --- | --- | --- |
| Newborn (0–3 months) | 14–17 hours | Short bouts day and night; about half REM; no stable rhythm yet |
| Infant (4–12 months) | 12–16 hours including naps | Day–night rhythm consolidates; most night sleep becomes continuous |
| Toddler (1–2 years) | 11–14 hours including naps | Usually one or two naps; REM share falling toward adult levels |
| Preschool (3–5 years) | 10–13 hours including naps | Most N3 of the life span; naps stop; sleepwalking and sleep terrors are common |
| [School age (6–12 years)](https://durgical.com/en/conditions/nocturnal-enuresis/) | 9–12 hours | Deep, efficient sleep; bedwetting becomes less frequent |
| Teen (13–17 years) | 8–10 hours | Delayed clock (late sleep and waking); marked fall in N3 |
| Adult (18–60 years) | 7 hours or more | Stable cycles; N3 slowly declining |
| [Older adult (65 years or more)](https://durgical.com/en/conditions/insomnia-disorder/) | 7–8 hours | Lighter, fragmented sleep; earlier bedtime and waking; more naps |

## Clinical notes

- In older adults, new snoring, witnessed pauses in breathing or daytime sleepiness suggest obstructive sleep apnea, not normal ageing.
- Bedwetting is common in young children and often stops on its own as they grow; it is evaluated when it persists in school age or reappears after a dry period.
- Many sleep complaints in older adults come from medical illness, pain, nocturia, medicines and low daytime light and activity, which are looked for before diagnosing insomnia.
- Teenagers who cannot fall asleep before midnight and cannot wake for school often have a delayed clock rather than a behavior problem.

## Memory aid

Babies dream, children dive, teens drift late, elders doze light: REM in infancy, N3 in childhood, phase delay in adolescence, fragmented sleep in old age.

## Test yourself

Think of the answer, then tap the question to see it.

## What share of a newborn's sleep is REM, compared with an adult?

About half of a newborn's sleep is REM (active sleep), against about a fifth to a quarter in adults.

## Which stage of sleep decreases most with ageing?

Slow-wave sleep (N3): it peaks in early childhood, falls sharply in adolescence and keeps declining; some older adults have almost none.

## Why do many adolescents fall asleep late and struggle to wake for school?

Puberty shifts the circadian clock later (phase delay), which clashes with early school start times and causes chronic sleep loss.

## What are three normal changes in the sleep of older adults?

Less N3 and more N1, more frequent awakenings with lower sleep efficiency, and an earlier circadian phase with more daytime napping.

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## Elsewhere in DurgiPedia

- [Wakefulness, sleep, the EEG and seizures](https://durgical.com/en/physiology/wakefulness-sleep-the-eeg-and-seizures/)
- [How organs age: normal changes vs disease](https://durgical.com/en/general-pathology/how-organs-age-normal-changes-vs-disease/)

## Connections

## Related 6

- [Sleep stages and their EEG](https://durgical.com/en/behavioral-science/sleep-stages-and-their-eeg/)
- [How sleep is regulated: sleep pressure, the circadian clock and melatonin](https://durgical.com/en/behavioral-science/how-sleep-is-regulated-sleep-pressure-the-circadian-clock-and-melatonin/)
- [Sleep hygiene and the behavioral treatment of insomnia](https://durgical.com/en/behavioral-science/sleep-hygiene-and-the-behavioral-treatment-of-insomnia/)
- [Adolescence: development and the HEADSSS interview](https://durgical.com/en/behavioral-science/adolescence-development-and-the-headsss-interview/)
- [Normal psychological ageing vs dementia](https://durgical.com/en/behavioral-science/normal-psychological-ageing-vs-dementia/)
- [Milestones of the first year](https://durgical.com/en/behavioral-science/milestones-of-the-first-year/)

## Related conditions 5

- [Insomnia disorder](https://durgical.com/en/conditions/insomnia-disorder/)
- [Obstructive sleep apnoea](https://durgical.com/en/conditions/obstructive-sleep-apnoea/)
- [Nocturnal enuresis](https://durgical.com/en/conditions/nocturnal-enuresis/)
- [Restless legs syndrome](https://durgical.com/en/conditions/restless-legs-syndrome/)
- [Dementia (major neurocognitive disorder)](https://durgical.com/en/conditions/dementia/)

[← All of behavioral science](https://durgical.com/en/behavioral-science/)

Educational content on behavior and the clinical relationship; not a diagnostic or treatment guide and no substitute for assessment by a health professional. If you or someone near you is at risk, seek help now from an emergency service or a mental-health helpline.

Sources: [How Sleep Works - Sleep Phases and Stages](https://www.nhlbi.nih.gov/health/sleep/stages-of-sleep) (National Heart, Lung, and Blood Institute (NHLBI), 2022); [About Sleep](https://www.cdc.gov/sleep/about/index.html) (Centers for Disease Control and Prevention (CDC), 2024); [Treatment of Bladder Control Problems & Bedwetting in Children](https://www.niddk.nih.gov/health-information/urologic-diseases/bladder-control-problems-bedwetting-children/treatment) (National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), 2024).

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Source: https://durgical.com/en/behavioral-science/normal-sleep-across-the-life-span/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/behavioral-science/normal-sleep-across-the-life-span/