Fatigue as a concept is extremely hard to define, since everybody has their own idea of what being tired means. Everybody is tired once in a while – the most common reason is, of course, lack of sleep. Fatigue can also be caused by a wide range of illnesses and diseases. In such cases, a person usually finds they suddenly (or even gradually) need more rest and sleep. This may affect their performance at work. Fatigue is also common when you’re feeling down.
It is very important to listen to your body. If you need to rest, then rest. If you know you have a really busy day coming up – a day out, a wedding or something that is going to take a lot of energy, then make sure you rest well for a couple of days leading up to it.