He was fast asleep.

I plan to go to sleep early tonight.

I need eight hours of sleep every night.

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

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.