|asleep at the wheel
||If you say that someone is asleep at the wheel, you mean that they are not sufficiently attentive, especially at a critical moment when vigilence is required.
When the firemen arrived too late at the scene, the night watchman was accused of being asleep at the wheel.
||If you have a short sleep during the day, you have a cat nap.
My dad often has a cat nap on a Sunday afternoon.
||If you have forty winks, you have a short sleep or rest, generally during the day.
Dad likes to have forty winks after a game of golf.
|hit the hay/sack
||When you hit the hay (or hit the sack), you go to bed.
The boys were so exhausted that they hit the hay as soon as they reached the campsite.
||If you lie in, you stay in bed after the normal time for getting up.
Great! Tomorrow I’m not on duty so I can lie in!
|out like a light
||If a person is out like a light, they are so tired that they fall asleep very quickly.
As soon as his head touched the pillow, he was out like a light.
|ready to drop
||Someone who is ready to drop is extremely tired and nearly too exhausted to stay standing.
I’ve been shopping all day with Judy. I’m ready to drop!
|sleep like a log
||If you sleep like a log, you sleep deeply or soundly.
After a day at the beach, I usually sleep like a log.
|sleep on it
||If you take time (until the next day) to think something over before making a decision, you sleep on it.
I suggest you sleep on it. You can give me your decision tomorrow.
|not sleep a wink
not get a wink of sleep
|If someone doesn’t get a wink of sleep, they don’t sleep a all.
It was so noisy in the hotel, I didn’t get a wink of sleep.
|not lose (any) sleep
||When something happens that in your opinion is not a cause for worry, you can say that you will not lose (any) sleep over it.
I’ve mislaid the book but i’m not going to lose any sleep over it.
|let sleeping dogs lie
||If you tell someone to let sleeping dogs lie, you are asking them not to interfere with a situation because they could cause problems.
Look, they’ve settled their differences. It’s time to let sleeping dogs lie.
||This term refers to a person who invests in a business without taking an active part in its management, and whose association with the enterprise is not public knowledge.
He works alone but his business is partly financed by a sleeping partner.