Let me try to explain the attachment.
Sleep is divided into several stages, with REM (Rapid Eye Movement) being one of them. This is where your dreams are the most vivid ones, and where you're most likely to remember your dreams from. Also, if you wake up from a REM stage, you will most likely fall asleep really fast, as I said.
Look at the picture, it displays the time in hours on the horizontal axis and the sleeping stage in the vertical axis. Try to wake up at the last (and longest) stage of REM. It's between 5 and 6 hours of sleep. And of course, you might have different bed-times, but try to base your timing on this graph. Don't hesitate to ask if you still don't understand it.
And yes, you can wake up within 6 hours of sleep, but the REM stages aren't that lengthy then. But if you think you really have to wake up earlier, then do it, but your success rate can decrease. Just look at the graph and plan your alarm time. Always remember, even if you don't wake up in REM, you can still trigger a FILD.
Good luck!

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