Dreams were once thought to only occur during REM sleep - however they can occur to a lesser extend in non-REM sleep phases
REM Sleep occurs in bursts for about a total of 2hrs per night usually about 90mins after falling asleep
Taking less than 5 minutes to fall asleep means you are sleep deprived with 10 - 15 minutes being average and means you are tired enough to sleep deeply
It is impossible to tell if someone is awake without medical supervision as people can take naps with their eyes open
One of the best predictors of insomnia later in live is developing bad habits as a result of having your sleep disturbed by children
The extra-hour of sleep received when clocks are put back at the start of daylight in Canada has been found to coincide with a fall in the number of road accidents.