When we are thinking about the situation, that some person would be captured in the spacecraft and some kind of humanoids make tests to that person, what takes hours, and people would see just the flash of the light, and the person would not seem to go anywhere, that would be a very big mystery. There are three possibilities, which can make that thing possible.
One is that those people have been under the effect of some kind of electromagnetic field, and those fields can cause so-called electromagnetic dreams, which means that the brains would see things, which are not true because brains cannot separate dreams or real observations. Sometimes it has been claimed that people have been targeted with high power radio waves because the system would cause overvoltage in the brains, and those researchers have thought that increasing the level of electricity in the neural system, that allows people to remember dreams, what they have seen.
This could be possible because the electric level of the brains would allow connecting the axons, which are normally reserved for other purposes. And maybe those people have been so tired, that they couldn't even recognize when they slept and that causes hallucinations. But the fact is that people normally don't remember their dreams.
The second choice is that the abduction would be done, but it has been happening somewhere in the past, and the person would remember that case in the dreams as the nightmare. So could those strange cases happen in some rooms at hospitals, when the person is young? And somebody just "lends" the baby. In that scenario, those kidnappers would be human, who want to make some kind of tests or just impacts the electric shocks to brain core, and brainwash the victim for thinking that some mafia-men would be some holy men, who must have jobs at banks.
Then in the adult age, that thing would make the flashback. In those cases, the victim would be exposed to chemicals like LSD and laughing gas, and during that case, somebody might use virtual reality or brain core electric manipulation for creating faked images in the mind of the victim. When consciousness is lower than in a normal situation, the person might not see virtual reality systems. Or that person doesn't realize that the place, where the thing happens is the own bedroom, because of strong hallucinogens.
But there is one more explanation, what could explain, why the person seems ever go out from a house during the abduction, and that thing is that the time in the UFO would travel slower than in the normal universe. In this hypothesis, the saucer-shaped UFO would equip with the system, what would accelerate person or some sub capsule inside the craft to the speed, what is near the speed of the light, that thing would make possible to make operations, what takes hours without people from outside would not see anything special.
And if we could stop the time, and we would have enough sophisticated technology, we could kidnap a person from the elevator, make our tests, and after that release that victim. The thing is that people would see anything. But the thing is that the accelerator, which is combined with the high-power electric transmitter would need an extremely powerful energy source. And the speed of the test capsule must be extremely high, that the time inside it would stop.
