What is sleep Inertia?

What is sleep Inertia?

Have you ever woken up on a morning and felt really groggy? If so, it’s likely you have been experiencing sleep inertia. This is when we are awake but our body is still in a sleeping state, including parts of our brain. This can make the simplest of tasks difficult, for example: brushing your teeth, making a cup of tea or packing a bag for school or work.

The brainstem arousal system is the part of the brain responsible for your physical functioning and is in charge of telling you how to do a job – like eating your breakfast or turning on the shower. However, our prefrontal cortex (PFC), which looks after decision-making and self control takes some time to warm up, making the first tasks of our day feel weird and unnatural.

Sleep inertia lasts between 15 and 30 minutes; but in some people may last up to four hours if sleep deprived! If you are one of those people who survive each morning on a 20 minute dash out the door, perhaps you should reevaluate your morning routine to give you some time to properly wake up before heading out. If you drive to work, beware of sleep inertia as research suggests that almost 20% of accidents on major roads are sleep-related. Like mentioned earlier our PFC takes time to warm up on a morning, meaning our reaction time and decision-making isn’t up to speed – this could prove costly for early rush hour drivers.

There are several ways to reduce the effects of sleep inertia, the most obvious is of course being well-rested. Getting enough sleep on a night is important to starting your day right, the more rested you are the less groggy you’ll feel and for a shorter period of time.

Another approach is timing your morning alarm to the end of a sleep cycle and waking up at the same time everyday. A complete sleep cycle is approximately an hour and a half, so the ‘best’ time to wake up would be seven and a half or nine hours after you go to sleep. Humans are creatures of habit so waking up at the same time everyday will feel more natural reducing the effects of inertia. Waking up in the middle of a cycle is likely to disrupt rapid-eye-movement (REM) sleep, which can makes us feel sleepy as we still have high levels of melatonin in this stage of sleep.

Has this solved your early-morning sleeping problems? Let us know on Facebook or Twitter.

Free UK Delivery

Our standard 2 Man Delivery Service (Mattresses & Divans)

  • Free UK delivery* to your room of choice throughout England, Scotland and Wales.
  • We provide a free professional two man delivery service that will deliver your purchases to your room of choice.
  • This service includes the set up of your bed or mattress in your chosen room, plus the removal and takeaway of the packaging.
  • We deliver most items Monday to Friday, 9am - 6pm.
  • On average products are delivered within 7 - 14 days.
  • *Some restrictions apply, please visit our delivery information for more detail.

Next Day Delivery Service (Mattresses/Bedframes)

  • Free Next Day Delivery, via a courier, to the door only.
  • A card will be left, with a contact number to call for re-delivery, if there is no one in.
  • Delivery will be between 8am - 7pm
  • If ordered with another item, the Next Day Delivery will be delivered first, usual delivery terms apply for additional items (this may incur 2 deliveries)

60 night comfort trial

We're so confident that our beds and mattresses will provide you with a great night's sleep that we offer the security of the very best in terms of comfort guarantee.

  • At Silentnight we want to be sure that you are satisfied with the comfort of your new bed or mattress which is why we offer a total peace of mind 60 night comfort guarantee. If for any reason you are not totally satisfied we will exchange your purchased bed or mattress for an alternative Silentnight bed or mattress of your choice.
  • We do however ask that you try your new bed for at least four weeks for your body to adjust to your new bed or mattress.
  • For full terms and conditions, please click here.

Total Quality Assurance

Before it gets to you your bed has been through a lot

  • All our mattresses, upholstered bases and headboards are made in the UK
  • All of our product meet European standards and exceed British standards
  • All our Upholstered beds and mattresses ordered through Shop.Silentnight are made to order
  • This means they are not stored for prolonged periods of time and are shipped to you direct from our factory.

Testing

  • Accredited onsite laboratory to bring the best products to you
  • Every Silentnight mattress type is tested to ensure it exceeds all British standards
  • Silentnight products are fully certified by the Forest Stewardship Council®(FSC®) FSC-C104461
  • We are full members of the Furniture Industry Sustainability Program.
Superbrands The Sleep Council nbf approved