This category contains only other categories, no dictionary entries. Its subcategories are on the topic: Sleep. They are of two sorts:
- Subcategories named like "aa:Sleep (with a prefixed language code) are categories of terms in specific languages. You may be interested especially in Category:en:Sleep, for English terms.
- Subcategories of this one named without the prefixed language code are further categories just like this one, but devoted to finer topics.
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This category has the following 53 subcategories, out of 53 total.