fast asleep

asleep at the switch

Neglectful of an important task, responsibility, or opportunity.

come thick and fast

To arrive rapidly in large groups.

dead asleep

Sleeping in a deep sleep

fall asleep

To be affected by paresthesia; to go numb.

fast and furious

Rapid and energetic.

fast sheet

A hotel or similar establishment catering to prostitutes.

fast times

A period of time characterized by quickly-paced activity, especially involving extravagant or risky conduct, sexual behavior, or other exciting events.

go nowhere fast

To fail to make any progress.