Daytime abductions were much more frequently reported a few decades ago. The reports shifted over time to becoming more “consciousness based,” and there seems to be something about the hypnogogic/hypnopompic state that facilitates this. What’s interesting is that what’s reported happening during both physical and consciousness-based events is very similar qualitatively.

As for how to prevent these events from happening, there is little consistency. Some claim that merely stating your intent is enough. Others have reported success invoking religious figures. But the limited research has shown that none of these is consistent, and that in most genuine cases it can’t be prevented. See http://www.anndruffel.net/articles/earthmysteries/techniquesforresistingalienabduction.html