As usual, I would leave Brian in his bb cot to play. Then one particular day, I realised that it was quiet, I presumed Brian had slept, so I went to check on, only to realise that his face had come under the buffer! And he was really sleeping. Usually if something covered his pace, he would cry to get our attention. He must have been very tired that day.  When I moved him away, he was still slepping.  Luckily, nothing happened to him, I must be very careful, told myself to tighten the buffer.