From un- + sleepable. <span class="searchmatch">unsleepable</span> (comparative more <span class="searchmatch">unsleepable</span>, superlative most <span class="searchmatch">unsleepable</span>) Not sleepable; unsuitable for sleeping. 1852, William...
From <span class="searchmatch">unsleepable</span> + -ly. <span class="searchmatch">unsleepably</span> So as to make sleep impossible. 1868, Nathaniel Hawthorne, Passages From the American Note-Books: Last night was...
sleepable spaces. 2002, John Kretschmer, Used Boat Notebook: The saloon includes long, sleepable settees and a fold-out table. sleepability <span class="searchmatch">unsleepable</span>...