wake up on the wrong side of bed

bark up the wrong tree

To take the wrong approach to a situation; to follow a false lead; to attempt to solve a problem using mistaken assumptions about its true nature.

bed blocker

An elderly hospitalized person who is too infirm to return home but not sufficiently ill to necessitate continued hospitalization, creating a situation in which his or her hospital stay is prolonged while authorities or relatives search for a suitable placement amid the scarce resources of nursing homes or other long-term care facilities.

bed in

To allow or help to settle in; to make (someone) feel at home.

bed of roses

A pleasant or easy situation; an untroubled existence.

bright side

A consoling aspect of a difficult situation.

butter one's bread on both sides

To profit from two things at the same time, especially when those things seem contradictory or incompatible.

do somebody wrong

To treat someone badly or unfairly.

err on the side of

To behave in a manner which favours or which is biased toward.