In my experience, I found that sleeping six hours is easier. Of course, I use my WBTBs with WILDs. I figured that If I set my alarm 6 hours past getting in bed (given about a half hour for me to fall asleep) then my alarm should wake me up right before my REM cycle, giving me optimal conditions for WILD.
But if you are going for traditional WBTB where you wake up, stay up for a bit, then go back to sleep intending to DILD or MILD, you might want to try sleeping 4.5 hours instead of 5. The reason is that each sleep cycle lasts around 1.5 hours. After 4.5 hours, you would have waken up directly out of your third REM cycle and a dream, as opposed to sleeping another half hour of NREM sleep without any recall. Everyone is different, so your sleep cycle may be longer or shorter than 1.5 hours, but this is a reasonable estimation. As far as I know, remembering a dream is an essential part of WBTB if you are using LaBerge's traditional method outlined in EWOLD.
So unless you are attempting to WILD with your WBTB, I suggest sleeping 4.5 so that you wake up directly from a dream and can recall it for your WBTB.
Hope this helped.
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