sleeping at the switch

asleep at the switch

Neglectful of an important task, responsibility, or opportunity.

let a sleeping dog lie

Alternative form of let sleeping dogs lie.

let sleeping dogs lie

To leave things as they are; especially, to avoid restarting or rekindling an old argument; to leave disagreements in the past.

sleeping giant

Someone or something with great, latent strength.

sleeping policeman

A speed bump.

switch off

To lose interest, and start thinking about something else.

switch on

To change one's expression or appearance as if by turning a switch.