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Reference.org
Sleep inversion
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<p>Sleep inversion or sleep-wake inversion is a reversal of <a href="/facts/Sleep/0bSDElWc">sleeping</a> tendencies. Individuals experiencing sleep-wake inversion exchange <a href="/facts/Diurnality/GgXnXvN7">diurnal habits</a> for <a href="/facts/Nocturnality/PqAkbpKf">nocturnal habits</a>, meaning they are active at night and sleep during the day. Sleep-wake inversion, when involuntary, can be a sign of a serious disorder. </p>