Brain frequencies during sleep cycle

Hi,
some tiome ago i have found a quite detailed information about brain frequency course during the whole sleep cycle (this info was like: the whole sleep cycle takes about 1,5 hour; first cca 10 minutes the brain goes from alpha to theta (12 hz to 7Hz); then there is a 15 minutes stage of light sleep on frequencies cca 6 Hz; etc. etc.). but now i am not able to google this info. :(
I need this info for my brainwave entrainment activities to try to simulate the whole sleep cycles.

thanks a lot for any info, link etc.

http://www.dreamviews.com/sleepstages.php

Try this link :)

I guess there aren't exact times in it... but I'm not positive you can get exact times, since everyone's sleep pattern is as unique as snowflakes. Correct me if I'm wrong?

thanks a lot! this is exactly what i was searching for.

and yes, you are absolutely right that everyone has different pattern of his sleep cycles, but what I want is to simulate one pattern that may be considered "healthy", then try to entrain people who have sleeping problems with it. and I wonder what the progress and results will be! :)

and I am open to any discussion related to brain entrainment.