“Yawning is often associated with stretching ... To hide this sign of tiredness, 53 per cent use their hand to cover the mouth, while others close their mouth tightly (44 per cent) or breath ...
“Yawning is often associated with stretching ... To hide this sign of tiredness, 53 per cent use their hand to cover the mouth, while others close their mouth tightly (44 per cent) or breath ...