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.

The sky is very beautiful, isn't it?

Seeing the empty cup, he poured another cup of tea.

He can recite the poem by heart.

There is not a single cloud in the sky.