Speaking as someone who has died 4 times* there was nothing during the periods I was dead. Just a discontinuity between one second and the next, with the first being the most distressing, since I fell off the bed and my face landed on my hand. Came back to life screaming with a bloody nose. If you've ever had anesthesia, it was exactly like that. I tend to waffle back and forth between agnostic and atheist still, but I really, really doubt there's an afterlife now.
* No joke, I developed Long QT Syndrome and my heart stopped pumping blood 4 times. The first 3 happened at home and my heart managed to sort itself out before I suffered brain damage or permanent death, the 4th happened at the ER and I got to find out what the aftermath of CPR feels like. Beats being dead, but boy did it hurt like hell for months. And that was with my not suffering any broken ribs.