In my opinion if time travel exists it wouldn’t require a Time Machine because then there would be multiple you’s which would make no sense. So instead maybe the consciousness of your mind would be transported to your past or future bodies, this makes sense because then there would only be you. That would be so cool to transport back and forth to your past and future bodies. Each time, it would be like waking up from a dream.
It's all about frequency. Raise your frequency high enough and you don't need a machine to time travel, mentally or even physically. No doubt the enlightened masters and many angelic beings have such abilities.
If you merge with or travel to your past or future selves in the Spiral Time Streams, they are not you exactly, rather they are different versions of you. When you time travel you would be accessing parallel realities.
I believe there are "dead zones" between the parallel realities, where the cinema exists, but where our consciousnesses are not presently flowing. I believe we can access those "dead zones" and flow within them, in the cinema of our bodies there. I believe the CIA has the technology to enable this.
I believe the CIA used that technology, soon after President Kennedy was assassinated and sent the consciousness of a woman back to her cinematic body in the "dead zone", so she could obtain a camera nearby and photograph what happened and leave the camera in a location from which the CIA could retrieve it.
But since another segment of the CIA and President Johnson himself, were complicent in the assassination, when they showed the pictures to authorities in the Federal Government, they were told to turn in all their photographs of the assassination and never ever talk about it again.
Another example of what I am calling "dead zones" between Parallel Realities, would be when people taken up by extraterrestrials are sometimes returned to such a "dead zone", before the Universe recalibrates and sends their body or consciousness to its appropriate location.