I was browsing through DV and then suddenly remember that almost of my LDs occur when I was taking a nap, which usually takes place in the afternoon. And so far I haven't read an explanation of this.

So I figure could this be the daylight that shines on your eyes, your body is tired but the light keeps you from going into deep sleep, enabling vivid LDs. This explains why I can't get LDs at night, even with WBTB.

If this is the case, we can use some source of light to enable LDs at night, but not too bright, so to match the level of daylight, this keeps our mind from going into a deep night sleep.

What do you guys think?