The kids had a lot of fun today . When they awoke , they were thrilled to see that Daddy had returned from his trip . They also discovered the presents that he bought for them and hid in their room . Nick immediately started building his puzzles before Daddy and Mommy realized the boys were awake .

Based on the preceding passage, answer the following question What may be the reason for them not knowing he was awake ?
He was being so quiet .