"sleeping draft" meaning in English

{
  "forms": [
    {
      "form": "sleeping drafts",
      "tags": [
        "plural"
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  ],
  "head_templates": [
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      "args": {},
      "expansion": "sleeping draft (plural sleeping drafts)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sleeping draught"
        }
      ],
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          "parents": [],
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          "bold_text_offsets": [
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              47,
              61
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          "ref": "1999, Robert Lacey, Danny Danziger, The Year 1000: What life was like at the turn of The First Millennium, London: Abacus, published 2000, page 130:",
          "text": "But the potion - which must have been a strong sleeping draft or its opposite, a stimulant or hallucinogen - can only have mitigated the agony.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative spelling of sleeping draught."
      ],
      "id": "en-sleeping_draft-en-noun-cRXiBPR5",
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          "sleeping draught",
          "sleeping draught#English"
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  ],
  "word": "sleeping draft"
}

{
  "forms": [
    {
      "form": "sleeping drafts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sleeping draft (plural sleeping drafts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sleeping draught"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with entries"
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          "ref": "1999, Robert Lacey, Danny Danziger, The Year 1000: What life was like at the turn of The First Millennium, London: Abacus, published 2000, page 130:",
          "text": "But the potion - which must have been a strong sleeping draft or its opposite, a stimulant or hallucinogen - can only have mitigated the agony.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative spelling of sleeping draught."
      ],
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        [
          "sleeping draught",
          "sleeping draught#English"
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  ],
  "word": "sleeping draft"
}