Oxford Dictionary of Idioms:
you have made you bed and must lie in it
you must accept the consequences of your own actions.
Facts on File Dictionary of Proverbs:
as you make your bed, so you must lie in it
You must put up with the unpleasant result of a foolish action or decision: [...] The proverb was first recorded, with different wording, c. 1590. A similar proverb was recorded in French a century earlier: "Comme on faict son lict, on le treuve [As one makes one's bed, so one finds it]." Variant of this proverb: you've made your bed, now lie in it.
A Dictionary of American Proverbs:
As one makes his bed, so he must lie. Vars.:
(a) After making your bed you must lie in it.
(b) If you make your bed hard, you can turn over oftener.
(c) Lie in your bead the way you made it.
(d) You made your bed, now lie in it.
Random House Dictionary of Popular Proverbs and Sayings:
You've made your bed, now lie in it.
You did exactly as you pleased, now you have to live with the consequences of your behavior and actions. The proverb has been traced back to about 1590 and is related to the fifteenth-century French proverb 'Comme on faict son lict, on le treuve' ("As one makes one's bed, so one finds it"). It was included in George Herbert's collection of proverbs in 1640 and in James Kelly's collection in 1721. It is first attested in the United States in "Cy Whittaker's Place" (1908) by J.S. Lincoln, and is found in various forms:
As one makes his bed, so he must lie;
As you make your bed, so you must lie in it;
As you made your apple-pie bed so you must lie on it;
You have buttered your bed, and now you must lie on it;
You buttered your bread -- now lie in it, etc. The main entry is listed in all major dictionaries of American proverbs [...]