Up, Sluggard, and waste not life; in the grave will be sleeping enough.

Benjamin Franklin (1706–1790) American statesman, scientist, philosopher, aphorist

Poor Richard (1741 ed.)
    (Source)

Repeated (as "There will be enough sleeping in the Grave") in the preface (1757-07-07) to Poor Richard Improved (1758 ed.); the preface was also reprinted as The Way to Wealth.

Possibly borrowed from (or from a common source as) Fuller (1727).