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How to wake up from your dream 
Set an alarm. 
If you are worried you may have a dream that you will want to wake up from, set an alarm for somewhere after 90 minutes into your sleep. Rem sleep happens 90 minutes into sleep, and it is during this cycle of your sleep that you dream, so having an alarm rouse you might help.
Some alarm clocks have more than one alarm you can set, so you can wake up from separate cycles of rem sleep. You can also use a mobile device, many of which allow you to set as many alarms as you like.