its quite simple. we dream when our brain we have REM (rapid eye movement) you have many REM periods during that night that happen at certain intervals... you can look it up if you really want to know. but they can time a light to turn on so that when your in REM you can see signs in your dreams that are telling you that your dreaming. |
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It doesn't, it's a cheap version. It is set to go off during the sleep cycle later during the night when you're in REM. Almost everybody's sleep cycles follow this pattern, and while there are some variations, the later REM periods are so long it doesn't matter. |
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