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.

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.

err on the side of caution

To act in the least risky manner in a situation in which one is uncertain about the consequences.