Using old-fashioned language, he said, 'I need to get some sleep.'

I sleep for 8 hours every night.

I have a headache due to lack of sleep.

In the old days, people said 'Nenu,' which meant 'to sleep,' as we say today.

In the old days, people went to bed when night came.

You need a sleeping bag when you sleep in the mountains.

I will sleep now.

Where does your younger sister live?

She is my sworn younger sister, and we are always together.

My younger paternal half sister is very smart.