The recommended amount of sleep for healthy adults is 7-9 hours, according to the National Institutes of Health. So why then, is it possible to feel better, more alert and refreshed after 7.5 hours sleep than getting a lengthier sleep of 9 hours?

Surely, more is more when it comes to sleep? Well, not always. In fact, there are a number of reasons that you might feel worse after 9 hours compared to 7.5. Here, a sleep expert shares these, as well as revealing which is the most common cause of waking up feeling groggy.

And, although we know one of the key ways to ensure you're waking up feeling great is to have one of the best mattresses for your sleep needs, we'll also be sharing a few more tips to help you ensure you wake up feeling refreshed every day of the week.

How much sleep do we n

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