Ken Grimwood’s World Fantasy Award-winning 1986 Replay is a stand-alone temporal recursion novel.
October 18, 1988: Jeff Winston is stuck in a dead-end radio job and his marriage to Linda is disintegrating. Distraction might be welcome, but what happens is unwelcome. He and his wife are in the middle of a painful discussion of divorce when Jeff has a massive and painful heart attack. Jeff dies, ending the marriage in an unsatisfactory way (from Jeff’s POV).
But … Jeff suddenly finds himself alive and well again. As a young Jeff, a college student in 1963.