sleeplessness

n [U].

sledge, sledge (also esp US sled), sleek, sleekly, sleekness, sleep, sleep-walker, sleep-walking, sleeper, sleepily, sleepiness, sleeping bag, sleeping partner (US `silent partner), sleeping policeman, sleeping sickness, sleeping-bag, sleeping-car, sleeping-pill, sleepless, sleeplessly, sleepwalk, sleepwalker, sleepy, sleet, sleeve, sleeveless, sleigh, sleight, slender, slenderly, slenderness, slept, sleuth, slew, slew (US also slue), slice, slick, slicker, slide, slide into,