The sleep cycle is known to repeat itself four to five times during an average persons single nights sleep, but has been know to repeat itself up to seven times. You can certainly see how it is possible for one person to have several different dreams in one night.
Most people only ever really remember the last dream they have; the one that occurs closer to the morning, before they wake up. Just because you do not remember those earlier dreams in the sleep cycle does not mean they never happened, it is just a case that you don’t remember them.
1. Stage one is characterised by NREM or non rapid eye movement. It is fundamentally the stage in which you are entering light sleep. Your muscles become relaxed, your heart rate becomes slower and your body temperature drops.
2. Stage two is also characterised by the NREM, but there is a further drop in body temperature and the muscle relaxation deepens. This is when the body’s immune system begins it’s task of repairing the body. In this stage, you are completely asleep.
3. Stage three sees that you are still within the NREM stage, but the sleep you are experiencing is very deep, with your metabolic levels being very slow.
4. Stage four is the point when the most vivid dreams occur. You move into the REM stage, where your eyes are erratically moving. Your heart rate rises along with blood pressure and your breathing may become irregular as your brain activity increases. If you are to wake during this stage of the sleep cycle, then this is where you are most likely to remember your dreams accurately.
Reference: http://dreamology.wordpress.com/2009/01/29/the-sleep-cycle/
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