On Sunday night, fans will watch the series finale of HBO's "Game of Thrones," ending their own nightly watch — but not all may be willing to let go after the 80-minute episode ends.

Instead, an estimated 4.9 million Americans will extend the mourning period for their favorite HBO fantasy epic well beyond that evening and skip work the following day, by either calling out sick or using a last-minute vacation day, according to a new poll by the Workforce Institute at Kronos.