don't let the bedbugs bite
cliché Sleep soundly and well. Part of the sing-song rhyme "good night, sleep tight, don't let the bedbugs bite," usually said to a child. I'll see you in the morning, love. Don't let the bedbugs bite!
(as) crazy as a bedbug
Insane. Often used jocularly. Primarily heard in US. Don't leave me alone with Uncle Stu, he's crazy as a bedbug!
crazy as a bedbug
AMERICAN, INFORMALIf you describe someone as crazy as a bedbug, you mean that their behaviour is very strange or silly. By now she'd concluded that Peters was crazy as a bedbug. Note: Bedbugs are small wingless insects that live in beds and bedding. They feed by biting people and sucking their blood.