APAD: out like a light

Definition

   someone falls asleep very easily and quickly                                

 

Examples

   1) After working a twelve hour shift yesterday, I was out like a light as   

   soon as I got into bed.                                                     

   

   2) After a tiring day of hiking, she collapsed onto the couch and was soon

   out like a light.                                                           

 

Etymology

   Being 'knocked out' in a boxing match involves a sudden and forceful loss of

   consciousness during a fight.                                               

 

Synonyms crash, drop off                                                       

 

- englishdaily626.com [edited]

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Many things can buttonhole a light sleeper at the entry to the land of Nod:

noise, light, a bad conscience, a full stomach, stress over money, work, or the

worst, the future. It wouldn't help counting sheep, wondering why the chicken

crosses the road, whether God exists, or why bad things happen to good people or

vice versa. Muscles could be so sore from overtraining that no amount of

adenosine and melatonin overcome. It gets harder as one grows older, I heard,

and I am thankful for every good night's sleep. "Out like a light" is ideal.