Feeling exhausted is so common that it has its own acronym, TATT, which stands for "tired all the time".

We all feel tired from time to time. The reasons are usually obvious and include:

• too many late nights
• long hours spent at work
• a baby keeping you up at night

But tiredness or exhaustion that goes on for a long time is not normal. It can affect your ability to get on and enjoy your life.

Unexplained tiredness is one of the most common reasons for people to see their GP.

You can find out more about sleep and tiredness on the NHS website.

The National Sleep Foundation also has lots of useful information.