Does my sleep change as I get older, and is that normal?
Sleep changes in predictable ways as you age, and much of that is normal. Take notice if your sleep deteriorates significantly, because that is not an inevitable fate and it can have consequences for your memory and health.
Yes, your sleep really does change as you get older, and that is largely normal. Three changes stand out the most: your biological clock shifts forward (you feel tired earlier, you wake up earlier), your total sleep time shortens, and you wake up more often during the night. That last point means you spend more time lying awake in bed.
The most striking change is the decline in deep sleep. This is one of the best-documented findings in sleep research. Deep sleep is the phase in which your brain consolidates memory traces, so less deep sleep is associated with memory problems and cognitive decline later in life. Whether that loss is truly the cause, or a side effect of other processes, is still being investigated.
An important nuance: most of these changes already occur between your twenties and middle age, not only once you are old. Healthy older adults then have largely stable sleep patterns after that point. Daytime napping does increase as partial compensation for the shorter night's sleep. The biological systems underlying your sleep -- the internal rhythm that regulates your day-night cycle and the mechanism that builds up sleep pressure -- also become less powerful. That explains why sleeping worse with age is so common.
What is a signal worth paying attention to: sleep problems that go beyond what belongs to normal ageing. Persistently sleeping too little substantially lowers the likelihood of healthy ageing. Curiously, the same applies to sleeping increasingly longer, as that can point to underlying health problems. In men, sleep deprivation is also associated with lower testosterone levels and higher stress hormone levels, which can be detrimental to metabolism.
There is one question science does not yet have a clear answer to: do older people genuinely need less sleep, or can they simply no longer generate the sleep they still need? This debate has not been settled. So if you suffer from sleep problems, do not assume they simply come with the territory. Discuss them with your general practitioner, especially if your sleep deteriorates significantly or if you regularly feel tired and forgetful during the day.
Based on multiple sleep studies in adults and older adults, including large-scale observational studies and longitudinal analyses. The evidence for the basic changes (deep sleep, timing, waking up) is consistent. The consequences for memory and cognition are probably causal but have not yet been definitively proven. The hormonal effect has been described in men; data on women are absent from these sources.
Why do you sleep worse as you get older, and do hormones play a role in that?
Sleeping worse with age is well documented and has multiple causes, including brain changes and, in women, the menopause. Hormones play a role, but often indirectly, such as through hot flushes, so hormone therapy is not a straightforward answer for everyone.
Is it true that older people get less deep sleep, and what does that mean?
Older people demonstrably get less deep sleep, and this is associated with higher risks of dementia and lower growth hormone production. Factors such as caffeine and an irregular sleep schedule worsen this, so those are the areas where the most direct action can be taken.
Do you age faster if you sleep too little?
Sleep deprivation demonstrably disrupts the processes that keep the brain young, particularly the clearance of harmful proteins and the protection of your memory. Make sure your sleep quality is in order, because fragmented sleep appears to be more dangerous than your average number of hours alone might suggest.
Does the menopause disrupt my sleep, and what can help?
The menopause genuinely disrupts your sleep, primarily through hot flashes and hormonal changes. Cognitive behavioural therapy for insomnia (CBT-I) is the best first step; hormone therapy or melatonin may come into the picture after that.
Does getting more sleep improve my memory?
Sufficient sleep demonstrably benefits your memory: your brain processes and stores new information while you sleep. Too little sleep impairs that processing after just one night.
Does melatonin as a supplement really work for better sleep in older age?
For older people with sleep complaints, particularly early-morning awakening, melatonin offers a modest but real benefit. The effect varies by person and complaint, the optimal dose is unclear, so start low and discuss long-term use with your doctor.