"Just that 24-48 hours can shift your circadian rhythm and cause poor sleep," he explains.

It has also been discovered that lesions to this part of the brain cause prolonged sleep or may produce coma.

Opioids can reduce the sensation of pain and cause deep sleep.

Also some substances, called stimulants - coffee is such an example - can cause poor sleep.

There are many diseases that cause poor sleep.

"And I imagine both of us have the will to resist the eye that causes sleep."

In low doses, these medicines may cause drowsiness and sleep.

In high doses, they may cause drowsiness and sleep.

Comment: Used for the side effect of causing sleep.

The subsequent pain has also been causing interrupted sleep.