A change in behaviour
Tiredness in children, as in adults, is sometimes expressed by irritation. Your child might become a bit grumpy and get upset more easily. However, others will be more cuddly and affection-seeking. They might also suck their thumb (or a dummy) or ask for their comfort blanket or another object with a strong emotional value.
A body that slows down
With tiredness, motor skill tends to decrease. This is when children tend to fall or signs of clumsiness and lack of coordination appear. Movements are slower, jerkier. Some children will look for comfort, either by themselves or from their parents. When they want to comfort themselves they might rock back and forth, sit in a quiet place with a blanket, for example, or bury their head in their chest.
Revealing facial expressions
When a child is tired, they have a tendency to yarn a lot, rub their eyes or even their ears. Their eyes can also tell you a lot about sleep and tiredness, whether its the dark circles underneath or a more vague look, where they seem to be staring into space…