I was so tired I could have sleptaround the clock.
我太累了,能睡整整一天。
2
The kids cannot see him as he leaves home early in the morning before they wake up, and he reaches home around midnight when kids have slept every day.
The female brain is designed to be cautious, most likely because historically the woman who slept with the first guy she met might have a harder time raising children; he might not stick around.