He suffers from sleep apnoeas and has trouble sleeping at night.

Sleep apneas can cause disruptions in breathing during sleep.

I had a treacle sleep last night.

The treacles sleep peacefully in their cozy beds.

I have accumulated a lot of sleep debts over the past week.

I need to buy some sleeping draughts.

He took a sleeping draught to help him fall asleep.

REM sleeps are important for brain function.

I saw a scare-sleep crawling on the wall.

The sleeping language has been revived by dedicated linguists.