Peter goes back to something he knows. Peter decides to go fishing. It is just before the dawn. It is the end of a very long night. They have been fishing in the dark.
Time goes slower in the dark.
There is a lot of time just for your thoughts. They look out and see a lone guy on the beach around a fire. Now, the last time a fire was present was just before Jesus died. That fire was also burning in the night. Then it was burning at the end of the night, just before the dawn.