Temporary Selective Call Blocking

Sorry, the titles a bit vague!

Basically, I work shifts, so I sleep at some odd times. I don't want to be disturbed by a random call/email while sleeping, but I'd still like for my wife/parents/select-few-people to be able to call me if it's important.

Is there a way/app that completely blocks all call/email/text/whatapp/etc notifications except for calls from a small number of contacts of my choosing? Obviously I want to apply this only temporarily - i.e. when I wake up I want to switch back to normal function where I get the usual notifications.

Thanks for any help.