The 2025 fantasy season was a good one for tight end sleepers. In fact, it can be argued that two of the top six tight ends and three of the top seven players by points could be characterized as sleepers (some would argue Tyler Warren and Harold Fannin Jr. broke out).
To me, a sleeper is a player who has never before been a reliable fantasy starter but is on the verge of statistical improvement. However, his final fantasy rank doesn’t project him to finish as a top-10 player (that characterizes a “breakout” player) at his respective offensive position.