From Longman Dictionary of Contemporary Englisha light sleepera light sleeperSLEEPsomeone who wakes up easily if there is any noise etc She’s quite a light sleeper. → light
Examples from the Corpus
a light sleeper• I hoped he was a light sleeper.• Sunlight coming through a nearby window or the sound of an early morning garbage truck can disturb a light sleeper.• He was a light sleeper, for long periods an insomniac.• She was always a light sleeper, uncannily sensitive even in sleep to the ring of the telephone. 