"catch some z's" meaning in English

{
  "etymology_text": "From the typical use of Zs in speech bubbles to represent the sounds a person makes when sleeping (especially snoring).",
  "forms": [
    {
      "form": "catches some z's",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "catching some z's",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "caught some z's",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "caught some z's",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "catch<,,caught> some z's"
      },
      "expansion": "catch some z's (third-person singular simple present catches some z's, present participle catching some z's, simple past and past participle caught some z's)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Sleep",
          "orig": "en:Sleep",
          "parents": [
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "His boss found him catching some z's at his desk yesterday.",
          "type": "example"
        }
      ],
      "glosses": [
        "To sleep."
      ],
      "id": "en-catch_some_z's-en-verb-1T5ola59",
      "links": [
        [
          "sleep",
          "sleep"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To sleep."
      ],
      "synonyms": [
        {
          "word": "sleep"
        },
        {
          "word": "catch some Z's"
        },
        {
          "word": "catch some zs"
        },
        {
          "word": "catch some Zs"
        },
        {
          "word": "grab some z's"
        },
        {
          "word": "grab some Z's"
        },
        {
          "word": "grab some Zs"
        },
        {
          "word": "catch z's"
        },
        {
          "word": "catch Z's"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-catch some z's.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/99/En-au-catch_some_z%27s.ogg/En-au-catch_some_z%27s.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/9/99/En-au-catch_some_z%27s.ogg"
    }
  ],
  "word": "catch some z's"
}

{
  "etymology_text": "From the typical use of Zs in speech bubbles to represent the sounds a person makes when sleeping (especially snoring).",
  "forms": [
    {
      "form": "catches some z's",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "catching some z's",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "caught some z's",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "caught some z's",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "catch<,,caught> some z's"
      },
      "expansion": "catch some z's (third-person singular simple present catches some z's, present participle catching some z's, simple past and past participle caught some z's)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English terms with usage examples",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Sleep"
      ],
      "examples": [
        {
          "text": "His boss found him catching some z's at his desk yesterday.",
          "type": "example"
        }
      ],
      "glosses": [
        "To sleep."
      ],
      "links": [
        [
          "sleep",
          "sleep"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To sleep."
      ],
      "synonyms": [
        {
          "word": "sleep"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-catch some z's.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/99/En-au-catch_some_z%27s.ogg/En-au-catch_some_z%27s.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/9/99/En-au-catch_some_z%27s.ogg"
    }
  ],
  "synonyms": [
    {
      "word": "catch some Z's"
    },
    {
      "word": "catch some zs"
    },
    {
      "word": "catch some Zs"
    },
    {
      "word": "grab some z's"
    },
    {
      "word": "grab some Z's"
    },
    {
      "word": "grab some Zs"
    },
    {
      "word": "catch z's"
    },
    {
      "word": "catch Z's"
    }
  ],
  "word": "catch some z's"
}