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• Stage 1 (light sleep).
• Stage 2 (so-called true sleep).
• Stage 3 to 4 (deep "slow-wave" or delta sleep).
Rapid Eye-Movement Sleep (REM) sleep is called active sleep. This is where
most vivid dreams occur. REM-sleep brain activity during REM-sleep is
comparable to brain activity in awake time, but the muscles are as if paralyzed.
These phenomena could possibly be a protective mechanism of the body that
prevents people from acting out their dreams.
All this appears to be pretty simple and easy to understand, but why do some
people have problems with these cycles?

What Causes Insomnia?
There is no one reason why some have insomnia and others don’t, but most
experts do agree that it is often brought on by stress and anxiety.
Short-term insomnia, which is the most common, can be caused by many
factors. Sometimes taking certain medications interrupts normal sleep. When you
suspect your medications are causing you to lose sleep, you should check with a
physician or pharmacist.
Caffeine often disrupts sleep, as we all have experienced at one time or another.
Even nicotine can cause wakefulness and quitting smoking can also be a cause
of short-term insomnia.
Depending on the time of day too much or too little light can disrupt sleep.
There are many different causes. Another common cause can be a person’s
reaction to change or stress.