short sleep vs light sleep

short sleep and light sleep both are nouns.

Word	Noun	Adjective	Verb	Adverb
short sleep	Yes	No	No	No
light sleep	Yes	No	No	No

As nouns, short sleep and light sleep are synonyms defined as:

short sleep and light sleep: sleeping for a short period of time (usually not in bed)

Other synonyms of short sleep include catnap, forty winks, nap, snooze.

short sleep (noun)	light sleep (noun)
sleeping for a short period of time (usually not in bed)	sleeping for a short period of time (usually not in bed)