The word sleepwalkers is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 24
Highest Scoring Words With Friends™ Plays In The Letters sleepwalkers
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Seven Letter Word Alert: (49 words)
asperse, aweless, earless, elapses, keepers, kelpers, lawless, leakers, leapers, leasers, peelers, pleaser, pleases, presale, presell, relapse, release, repeals, repeels, resales, reseals, reseeks, resells, reskews, respeak, respell, resweep, reswell, rewalks, sealers, seekers, sellers, serapes, skelper, skewers, sleeker, sleeper, spaller, sparkle, speaker, speller, spewers, sprawls, sweeper, sweller, walkers, warless, weasels, weepers