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Sleeping Too Little or Too Much? Neurologist Explains Health Risks

Sleeping Too Little or Too Much? Neurologist Explains the Health Risks

<span>Sleep</span> is one of the most important factors for overall health and well-being, influencing both physical and mental health. Yet, how much sleep a person actually needs remains a common topic of debate.

Dr <span>Sudhir Kumar</span>, a neurologist at Apollo Hospitals, addressed several misconceptions and shared evidence-based insights about sleep that everyone should know.

In a detailed post on social media platform X, Dr Sudhir said that most adults need 7–9 hours of sleep per night.

While some may function well with slightly less or more sleep, he noted that "regularly <span>sleeping</span> less than six hours or more than 9–10 hours is associated with adverse health outcomes."

<h2><span rel="noindex">Sleep Consistency</span> Matters Too</h2>

While sleep duration is important, sleep consistency is equally important.

"Going to bed and waking up at roughly the same time every day helps regulate your circadian rhythm," he said.

Irregular sleep schedules, on the other hand, are associated with poorer metabolic health, mood disturbances, and daytime sleepiness.

Dr Sudhir said that most modern adults follow a monophasic pattern, with one main sleep period at night.

However, "a biphasic pattern (night sleep plus a short <span>afternoon nap</span>) can also be healthy if total sleep duration is adequate and the nap does not interfere with nighttime sleep."

<h2>Does Everyone Need an Afternoon Nap?</h2>

Not necessarily, said Dr Sudhir, popularly known as Hyderabaddoc on X, adding that many healthy adults do perfectly well without naps.

However, naps may be particularly useful for:

• Older adults with increased daytime sleepiness

• Those performing safety-critical tasks requiring sustained alertness

Further, he said that a 10–30-minute nap, also known as a power nap, is usually best, and may help:

However, naps lasting more than an hour may cause "sleep inertia" (grogginess) and disrupt nighttime sleep in some individuals.

<h2><span rel="noindex">Night Shift Work</span> And Health Impacts</h2>

"Night shift work is not biologically normal," Dr Sudhir said.

Humans are programmed to be awake during the day and asleep at night. Long-term night shift work has been associated with increased risks of:

Dr Sudhir also addressed the common belief that people can make up for lost sleep during weekends.

While "partial recovery is possible," he said weekend catch-up sleep does not fully reverse the effects of chronic sleep deprivation.

Large shifts in sleep timing during weekends, often referred to as "social jet lag," can disrupt circadian rhythms.

He advised keeping wake-up and bedtime within about one to two hours of the weekday schedule.

He also warned against relying on multiple alarms every morning, which according to him "suggests insufficient sleep, poor sleep quality, and circadian misalignment."

<h2>How Inadequate Sleep Can Affect You</h2>

Dr Sudhir said regularly sleeping more than 9–10 hours may be associated with higher risks of cardiovascular disease, depression, frailty, and mortality. 

At the same time, the neurologist noted that "even one night of inadequate sleep can impair performance".

 Short-term sleep deprivation can lead to:

 Chronic insufficient sleep is associated with:

"Sleep is a fundamental biological requirement, just like nutrition and exercise," Dr Sudhir said.

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Sleep is one of the most important factors for overall health and well-being, influencing both physical and mental health. Yet, how much sleep a person actually needs remains a common topic of debate.Dr Sudhir Kumar, a neurologist at Apollo Hospitals, addressed several misconceptions and shared evidence-based insights about sleep that everyone should know.In a detailed post on social media platform X, Dr Sudhir said that most adults need 7–9 hours of sleep per night.While some may function well with slightly less or more sleep, he noted that "regularly sleeping less than six hours or more than 9–10 hours is associated with adverse health outcomes."Sleep Consistency Matters TooWhile sleep duration is important, sleep consistency is equally important."Going to bed and waking up at roughly the same time every day helps regulate your circadian rhythm," he said.Irregular sleep schedules, on the other hand, are associated with poorer metabolic health, mood disturbances, and daytime sleepiness.Monophasic vs Biphasic SleepDr Sudhir said that most modern adults follow a monophasic pattern, with one main sleep period at night.However, "a biphasic pattern (night sleep plus a short afternoon nap) can also be healthy if total sleep duration is adequate and the nap does not interfere with nighttime sleep."Does Everyone Need an Afternoon Nap?Not necessarily, said Dr Sudhir, popularly known as Hyderabaddoc on X, adding that many healthy adults do perfectly well without naps.However, naps may be particularly useful for:• Shift workers• People with sleep debt• Older adults with increased daytime sleepiness• Those performing safety-critical tasks requiring sustained alertnessFurther, he said that a 10–30-minute nap, also known as a power nap, is usually best, and may help:• Improve alertness• Improve concentration• Reduce fatigue• Enhance performanceHowever, naps lasting more than an hour may cause "sleep inertia" (grogginess) and disrupt nighttime sleep in some individuals.Night Shift Work And Health Impacts"Night shift work is not biologically normal," Dr Sudhir said.Humans are programmed to be awake during the day and asleep at night. Long-term night shift work has been associated with increased risks of:• Obesity• Type 2 diabetes• Cardiovascular disease• Mood disorders• Workplace accidents Sleep During WeekendsDr Sudhir also addressed the common belief that people can make up for lost sleep during weekends.While "partial recovery is possible," he said weekend catch-up sleep does not fully reverse the effects of chronic sleep deprivation.Large shifts in sleep timing during weekends, often referred to as "social jet lag," can disrupt circadian rhythms.He advised keeping wake-up and bedtime within about one to two hours of the weekday schedule.He also warned against relying on multiple alarms every morning, which according to him "suggests insufficient sleep, poor sleep quality, and circadian misalignment."How Inadequate Sleep Can Affect YouDr Sudhir said regularly sleeping more than 9–10 hours may be associated with higher risks of cardiovascular disease, depression, frailty, and mortality. At the same time, the neurologist noted that "even one night of inadequate sleep can impair performance". Short-term sleep deprivation can lead to:• Reduced attention• Slower reaction time• Poor decision-making• Mood changes• Increased accident risk Chronic insufficient sleep is associated with:• Hypertension• Type 2 diabetes• Obesity• Cardiovascular disease• Depression and anxiety• Cognitive decline• Reduced quality of life"Sleep is a fundamental biological requirement, just like nutrition and exercise," Dr Sudhir said.

sleeping too little or too much? neurologist explains the health risks

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