Ask anyone how they're feeling these days and chances are, the word 'tired' will appear somewhere in their response.
There are plenty of things we blame for this constant lethargy - with everything from our work schedule to our nutritional intake coming under the microscope.
However, it's now been claimed that your weekend habits could be responsible for making you feel sluggish all the time.
Research has found that sleeping late into the day at weekend to make up for late nights out could leave you with "social jet lag' - which has the same impact on your body as taking a long-haul flight.
Getting less sleep than you need during the week and then oversleeping at weekend can reportedly leave you with a "majadjusted brain", according to the Huffington Post.
How to get around it? Stick to a regular sleep pattern throughout the week to avoid that sluggish feeling!