Jackson's doctor became the subject of a police investigation after admitting he gave Jackson a powerful drug to help him sleep.

VOA: special.2010.01.02

He also tried hypnosis. He wanted to see if putting patients into a sleep-like condition would help ease troubled minds.

VOA: special.2010.04.13

He began to take drugs to help him sleep.

VOA: special.2010.04.04

These drugs help people get to sleep and maybe stay that way, but the real future may be in medicines that help people get the right kind of sleep.

FORBES: Sleep On Demand

Thinking he was suffering from insomnia, his family doctor suggested zolpidem to help him sleep.

FORBES: Molecules, Money, and Ambien Awakenings

But parents who have successfully used allergy medicine to help children sleep swear by it, albeit in hushed tones.

BBC: Should parents drug babies on long flights?