I was wondering if there could be one simple mental activity that could help you to both DILD and WILD. One idea I've been toying with is the mental activity of imagining yourself falling:

As you go about your daily business, you try to fall through the floor (or ground, etc) and then imagine the sensation of falling. Last thing at night in bed, you imagine falling through the bed and again, try to capture the feeling of falling (a kind of "lurch" in the stomach, the sound and feeling of wind blowing past your ears and body).

The idea (as far as DILDs are concerned) is that falling will be incorporated in your dreams somehow because you think about falling so much during the day. As soon as you fall in a dream it's your dreamsign and you realise you're dreaming. Your RC in that situation is to try to either fall faster or slower, or change direction and fly up. During your WBTB your main focus is on the sensation of falling.

As far as WILDs are concerned, you could go into a WILD attempt imagining falling. I think it would also be important to get into the habit of imagining the falling sensation every time you wake - the very moment you wake. If you wake up and are in SP, trying to fall can lead to "falling into" a dream.

If you fail to WILD, then the thoughts of falling could lead to a dream featuring falling, thus you also have a chance to DILD.

So, to sum up: Just try to imagine falling and its sensations as much as possible. Particularly when you go to sleep and when you first wake up.

(This may also work with flying instead of falling, but I don't think I've heard of many people flying into a dream during WILDing.)

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I haven't tested this as much as I'd like because of other LD experiments, but I thought I'd post it so see what people think.