sleep
...that some animals interrupt their hibernation a couple of times during winter so that they can sleep?
...that some animals interrupt their <a href="./Hibernation" id="mwE34" rel="mw:WikiLink" title="Hibernation">hibernation</a> a couple of times during <a href="./Winter" id="mwE38" rel="mw:WikiLink" title="Winter">winter</a> so that they can <b id="mwE4A"><a class="mw-redirect" href="./Sleep_(non-human)" id="mwE4E" rel="mw:WikiLink" title="Sleep (non-human)">sleep</a></b>?