• Question: do fish sleep with there eyes open

    Asked by emily72 to Charlotte, Jo, Kevin, Louise, Valeria on 19 Jun 2012. This question was also asked by scientificgrapefruit.
    • Photo: Joanna Cruden

      Joanna Cruden answered on 19 Jun 2012:

      Yes a lot of fish sleep with their eyes open, some don’t even have eyelids, they often don’t sleep in the same way we do but have a period of deep rest

    • Photo: Kevin Mahon

      Kevin Mahon answered on 19 Jun 2012:

      Fish don’t actually sleep as we would normally define it – they have extended periods of inactivity or ‘rest’ but they never go into a rapid eye movement sleep like mammals would.

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