So far the only sucessful OBEs I have had are after doing something similar to what astralshadows suggested. If you try at bedtime, odds are you will fall asleep. Set your alarm two hours before you usually wake up and walk around or read for a bit. Then when you return to bed you should be alert enough to try it. Sometimes I try it when its time to get up in the morning, but by that time my brain is too awake.
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