While we need to sleep 7-9 hours per day, almost 40% of us sleep less than the minimum amount. As an example parents of a newborn child sleep 450-700 hours in their first year of parenting. Watch this amazing video to learn more about sleep:
REM sleep
occurs in bursts totalling about 2 hours a night, usually beginning about 90 minutes after falling asleep.
Dreams, once thought to occur only during REM sleep, also occur (but to a lesser extent) in non-REM sleep phases. It’s possible there may not be a single moment of our sleep when we are actually dreamless.
REM dreams are characterised by bizarre plots, but non-REM dreams are repetitive and thought-like, with little imagery – obsessively returning to a suspicion you left your mobile phone somewhere, for example.

The Social Impact of Substance Abuse
Often when people are addicted to something they only think about their next fix. “I mean after all it’s my addiction, my problem. Right?” Wrong!