We spend one-third of our lives sleeping.

A newborn results in 400-750 hours lost sleep for parents in the first year.

The current world record for the longest period without sleep is 11 days, set by 17-year-old San Diego student Randy Gardner in 1965.

Studies have shown that there is generally less sexual activity if one of the partners is a heavy snorer.

Most of what we know about sleep we've learned in the past 25 years.

Rats deprived of sleep die sooner than rats deprived of food.

In humans, the earliest occurrence of a yawn happens at about 11 weeks after conception.

Pythons require about 18 hours of sleep per day.

Most driver cabins of long distance trains are equipped with the button that beeps every minute, and shuts down only when pushed by the driver – this help to keep train drivers awake and alert.

17 hours of sustained wakefulness leads to a decrease in performance equivalent to a blood alcohol level of 0.05% (two glasses of wine).

After five nights of partial sleep deprivation, three drinks will have the same effect on your body as six would when you've slept enough.

Sometimes yawning may be caused by simply looking at a picture of a person or animal yawning, or even seeing the word "yawn".

Discover your natural 24 hour body clock.

How sleepy are you now?