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Sleep deprivation and the immune system – why you get sick more easily when you sleep too little

Sleep deprivation and the immune system – why you get sick more easily when you sleep too little

By getting enough hours of sleep on average per night, you support your body's ability to defend itself against infections. In fact, lack of sleep can weaken your immune system, which in turn makes you more susceptible to viruses, bacteria, and long-term illnesses.

Quick version

With sleep deprivation, the following happens in your body:

  • The body’s production of immune cells (such as T cells) decreases
  • Inflammatory markers in the blood increase
  • The body responds less effectively to vaccines and infections
  • Recovery after illness and colds becomes slower

How much sleep do you need?

To support your immune system in the best possible way, the following amount of sleep per night is recommended:

Age Recommended sleep per night
Adults (18–64 years) 7–9 hours
Older adults (65+) 7–8 hours
Teenagers (14–17 years) 8–10 hours

Less than 6 hours of sleep per night over a prolonged period has been linked to an increased risk of infections and chronic inflammation.

Read also: Strengthen your immune system before winter

Can you measure how well your immune system is functioning?

Yes – certain blood tests can provide an indication of how your immune system is functioning. By analyzing different types of markers in the blood, it is possible to gain insights into:

Get insights into your immune system

Order the blood tests that are relevant to you and complete your sample collection. Within just a few days, you will receive your test results and an indication of how your immune system is functioning.

If you create a custom referral with markers that do not include a medical opinion , you can easily add this as an extra service.


Written by: The team at Testmottagningen.se · Reviewed by:The medical team at Testmottagningen.se

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