I have to go to sleep. ✬

You should sleep. ✬

We can't sleep because of the noise. ✬

I think I'm gonna go to sleep. ✬

How many hours of sleep do you need? ✬

How long does a bear sleep? ✬

When bears sleep or lie down, their postures depend on whether they want to get rid of heat or conserve it. ✬

I couldn't sleep well because it was noisy outside. ✬

We must sleep at least eight hours a day. ✬

I sleep on my side. ✬