What does the cryptic crossword clue "Light sleep (6)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Light sleep (6)

Guardian Cryptic #27299 | 19 Down | 2017-09-11 flower

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Also seen in

Guardian Cryptic #26771 (2016-01-04) Telegraph #28133 (2016-06-06)