Does sleep affect cognitive function/intelligence?

Connection Between Sleep and Memory

Sleep, our body's natural healer, has a close relationship with our memories. Different stages of sleep affect how we remember things. Not getting enough or sleeping too much can disrupt this connection, making it harder to remember things. To truly understand this, we need to explore how sleep patterns and memory work together.

Inadequate Sleep

Not getting enough sleep is like a troublemaker, disturbing our memory system. When we're in deep sleep, our brain moves information from short-term to long-term memory, which helps us learn and remember new things.

But if we don't sleep well, this process doesn't work properly, and our memories stay stuck on the surface of our minds.

During the rapid eye movement (REM) stage of sleep, our brain processes emotional memories. Not sleeping enough disturbs this stage, making it hard for our brain to understand and remember emotional experiences. This can result in blurry and less detailed memories.

Understanding the Complexities of Too Much Sleep

Too much sleep can feel like getting lost in a big, unfamiliar place during bedtime. Sleep is like a magic potion for a refreshed mind, but having too much of it creates unique problems. Extra sleep confuses our body's natural clock, making it hard to know when to be awake or asleep. It's like a garden getting too much water, pouring the vibrant plants, and making it tough for our minds to stay clear.

When we sleep too much, our dreams get all mixed up. The part of sleep where we have rapid eye movement (REM phase) lasts too long, making it hard to tell what's real and what's a dream. This excessive dreaming changes the way our brain works, creating strange and mixed-up dream worlds instead of the peaceful, sensible dreams we get with good sleep.

The Impact on Cognitive Functions

Remembering things isn't the only important brain job. It's like a big puzzle where memory, paying attention, solving problems, and being creative are all connected. If we don't sleep enough or sleep too much, it messes up this puzzle. It's like knocking down one piece, and then the whole puzzle doesn't work as well. So, getting the right amount of sleep helps our brain do its best work in all these areas!

Attention and Concentration

When we've had enough sleep, our minds are sharp and quick. We can do tasks easily and accurately. But when we don't sleep enough, our focus and attention suffer. Easy things become really hard because our tired brains can't concentrate well.

Surprisingly, sleeping too much has the same effect. Even though you might think more sleep means being more alert, it's the opposite. Too much sleep makes you feel lazy, like having a mental hangover. It messes up your focus and concentration. So, the key is to find the right balance for your sleep to keep your mind sharp!

Problem Solving and Creativity

Not getting enough sleep makes it hard for our brain to think creatively and find new ideas. It's like our creativity gets hidden under the weight of feeling very tired.

Sleeping too much has similar effects, although it's not studied as much. Too much sleep makes our brain less active, so the messengers in our brain can't talk to each other well. This stops our ability to think creatively. It's like our mind is lost in a fog and can't explore new imaginative ideas. So, finding the right amount of sleep helps our brain think creatively and solve problems effectively!

Finding the Right Amount of Sleep

For good memory and sleep, it's not just about how long you sleep, but how well you sleep. Having regular and enough sleep helps your memory and brain work better. The important thing is to know how much sleep you personally need, so it fits with your lifestyle and what you have to do every day.

Getting Enough Sleep

Here are some tips for getting better sleep:

  1. Take a warm bath or listen to calming music before bed.
  2. Avoid reading or watching TV in bed.
  3. If you wish to read for 15-20 minutes, leave your bed and read in dim light. When you feel sleepy, go back to bed. Don't change your wake-up time.
  4. Do moderate exercise for 45 minutes to reduce your stress, but do it earlier in the day. Try stretching or yoga before bed to get quality sleep.
  5. Do challenging tasks earlier and relaxing things later in the day.
  6. Don't go to bed hungry, but don't eat a big meal If you snack, keep it light.
  7. Don't have caffeine before going to sleep.
  8. Don't drink much after dinner to reduce nighttime bathroom trips.
  9. Have a comfortable bed and keep your room dark and quiet. Consider using a sleep mask or earplugs.
  10. Supplements are promote quality sleep, like melatonin or magnesium.

Sleep Hygiene

Developing healthy sleep habits, often termed sleep hygiene, is paramount. This includes cultivating a relaxing bedtime routine, maintaining a consistent sleep schedule, and creating an ideal sleep environment—dark, quiet, and cool. Limiting screen time before bedtime is crucial, as the blue light emitted by electronic devices disrupts the production of melatonin, a hormone essential for regulating sleep cycles.


Getting the right amount of sleep is like finding the perfect recipe for a good memory and a sharp mind. It's important to balance our sleep, just like balancing ingredients in a recipe, to keep our memory clear and strong. By understanding our body's natural patterns and creating a comfortable bedtime routine, we help our brain connect memories like putting together pieces of a puzzle. So, remember, good sleep equals a bright mind!


Back to blog