Older adults generally still require about 7 to 8 hours of sleep per night, although individual needs vary. The idea that ageing means a person only needs a few hours of sleep is not supported by modern sleep recommendations. What often changes with age is sleep architecture and continuity rather than the disappearance of the biological need for sleep. Older adults tend to experience more frequent awakenings, less deep slow-wave sleep and greater sensitivity to environmental disturbance. They may also shift towards earlier sleep and waking times because circadian rhythms can change with age. Consequently, an older adult may spend more time in bed without obtaining substantially more consolidated sleep.
Ageing is associated with changes in the distribution of NREM sleep, particularly a reduction in slow-wave sleep. REM sleep may also change, although the precise trajectory varies considerably. Sleep becomes more fragmented, with more awakenings and periods of lighter sleep. These changes can be normal aspects of ageing and do not necessarily indicate insomnia or disease. However, the distinction between normal age-related change and pathological sleep disruption is important because medical conditions, medications and sleep disorders become more prevalent with advancing age and can compound physiological changes in sleep architecture.
Circadian timing can shift earlier in older adults, producing a tendency to become sleepy earlier in the evening and awaken earlier in the morning. This can be related to changes in the circadian pacemaker, light exposure and other age-associated biological changes. Some older adults therefore experience difficulty remaining awake during evening activities and wake very early. This pattern is not automatically abnormal, particularly if the person obtains adequate sleep and functions well during the day. It becomes more clinically relevant when the timing interferes with desired activities or produces substantial daytime impairment.
Medical conditions are an important reason why sleep can become less restorative with age. Chronic pain, arthritis, respiratory disease, cardiovascular conditions, urinary symptoms, reflux, neurological disorders and mental-health conditions can interrupt sleep. Nocturia, or waking to urinate, becomes more common with age and can fragment sleep. Medications can also alter sleep, with some causing sedation and others producing insomnia or nighttime alertness. Consequently, persistent sleep disruption in an older adult should not simply be dismissed as an inevitable consequence of ageing.
Obstructive sleep apnoea is particularly relevant because its prevalence increases with age and because symptoms can be less obvious than the classic stereotype of a sleepy middle-aged person. Loud snoring, witnessed breathing pauses, gasping, morning headaches, nocturnal awakenings and daytime fatigue can occur. Sleep apnoea involves repeated partial or complete upper-airway obstruction during sleep, causing oxygen desaturation and arousals. It can contribute to hypertension, cardiovascular disease and impaired daytime alertness, making appropriate diagnosis and treatment important.
Older adults can also experience changes in sleep due to retirement and altered daily routines. Reduced exposure to morning daylight, less daytime physical activity, daytime naps and irregular schedules can weaken circadian cues and reduce nighttime sleep pressure. Napping is not inherently unhealthy and may be useful when brief and appropriately timed, but long or late-afternoon naps can make nighttime sleep more difficult for some people. Regular daytime activity, morning light exposure and a stable sleep-wake schedule can help maintain circadian alignment.
The consequences of inadequate sleep in older adults include impaired attention, slower reaction time, poorer balance and increased risk of falls, in addition to effects on mood and cognitive performance. However, claims that every episode of poor sleep directly causes dementia or irreversible cognitive decline would be too strong. Sleep, neurodegenerative disease and cognitive impairment have complex bidirectional relationships, and sleep disturbances can be both symptoms and potential contributing factors. Persistent cognitive or behavioural changes should therefore be medically assessed rather than attributed solely to sleep duration.
The appropriate target for most older adults remains approximately 7 to 8 hours of sleep, but the quality and continuity of that sleep matter greatly. A person who naturally sleeps seven hours, wakes refreshed and functions normally may not need to force themselves to remain in bed longer. Conversely, someone spending eight or nine hours in bed but experiencing frequent awakenings and substantial daytime sleepiness may have an underlying sleep disorder or medical problem. Persistent insomnia, excessive daytime sleepiness, loud snoring, breathing pauses, restless legs, repeated nighttime awakenings or major changes in established sleep patterns warrant discussion with a healthcare professional rather than being assumed to be normal ageing.
