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Which organ works during sleep?

Melatonin, released by the pineal gland , controls your sleep patterns. Levels increase at night time, making you feel sleepy. While you're sleeping, your pituitary gland releases growth hormone, which helps your body to grow and repair itself.

health.qld.gov.au - 7 amazing things that happen to your body while you sleep
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There’s a lot we don’t know about sleep. Questions like why we have sleep cycles, why we dream and why humans even need sleep in the first place are ones scientists are still finding exact answers to. But one thing’s for certain: when we sleep, and sleep well, we feel better physically and mentally, and perform better during the day. Read on to find out some of the things we do know about sleep and why it’s so important for our bodies and minds.

1. Your brain sorts and processes the day’s information

Don’t be fooled into thinking that when you’re asleep your brain has shut off too. Your brain is actually quite busy while you sleep, sorting and storing information from the day. This process is particularly important for creating long term memories, as your brain consolidates all the information it’s picked up during the day and files it away for later use.

2. Hormones flood your body

There are a number of different hormones released during sleep, all with different purposes. Melatonin, released by the pineal gland, controls your sleep patterns. Levels increase at night time, making you feel sleepy. While you’re sleeping, your pituitary gland releases growth hormone, which helps your body to grow and repair itself.

3. Your sympathetic nervous system chills out

During sleep, your sympathetic nervous system – which controls your fight or flight response – gets a chance to relax. Studies have shown that when we’re deprived of sleep, sympathetic nervous system activity increases, which is also mirrored by an increase in blood pressure. Scientists studying coronary disease are investigating whether there’s a relationship between decreased sleep duration and increased risk of heart disease.

4. Cortisol levels lower

Levels of cortisol, often called the stress hormone, decreases during the first few hours of sleep before rising to peak soon after you wake up. This helps makes you feel perky when you wake up and switches on your appetite.

5. Your muscles paralyse

While asleep, you cycle through periods of non-rapid eye movement sleep (NREM) and rapid eye movement sleep (REM). It’s during REM sleep that we have the most vivid dreams. During this stage, your muscles are temporarily paralysed, meaning you can’t move. Some scientists think this might be so that you don’t physically act out your dreams.

7. Your immune system releases inflammation fighting cytokines

While you’re sleeping, your immune system releases a type of small proteins called cytokines. If you’re sick or injured, these cytokines help your body fight inflammation, infection and trauma. Without enough sleep, your immune system might not be able to function at its best. Your body does a lot of important work while you’re asleep. Good sleep is vital for your physical and mental health, so if you’re having trouble falling asleep, staying asleep, not feeling rested when you wake up or feeling tired during the day, talk to your doctor about what you can do to improve your sleep or whether there’s an underlying health issue or sleep disorder causing your lack of Zs.

More reading on sleep:

Insomnia: what is it and when should you get help?

You won’t believe what triggered by sleepwalking…

Sleep Health Foundation Australia

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