Okay, this is better than the last sleep-related post I made.  This lists some serious facts.

REM sleep occurs in bursts totalling about 2 hours a night, usually beginning
about 90 minutes after falling asleep  (Ed. note - REM is considered the deepest type of sleep)

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 record for the longest period
without sleep is 18 days, 21 hours, 40 minutes during a rocking chair marathon.
The record holder reported hallucinations, paranoia, blurred vision, slurred
speech and memory and concentration lapses

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

Experts say one of the most alluring sleep distractions is the 24-hour
accessibility of the internet

And that’s just a few.  Read more here (unless it’s keeping you from a nice medium temperature bed)
http://abc.net.au/science/sleep/facts.htm