If there's a particular time of day when your ten kittens settle down to nap, you can call that their period of quiescence, or the time when they are all quiet and restful.

The noun quiescence looks similar to the word "quiet" for a good reason: quiescence is a quiet spell or state. It's used often to mean "dormancy," or the quieting of a symptom or a disease, such as the quiescence of a child's asthma symptoms during the winter months. The Latin root word is quies, which means "rest or quiet."

Definitions of quiescence
  1. noun
    a state of quiet (but possibly temporary) inaction
    synonyms: dormancy, quiescency
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    cessation from or slowing of activity during the winter; especially slowing of metabolism in some animals
    aestivation, estivation
    (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period
    a dormant or quiescent state
    type of:
    inaction, inactiveness, inactivity
    the state of being inactive
  2. noun
    quiet and inactive restfulness
    synonyms: dormancy, quiescency, sleeping
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    inactivity that is passive and monotonous, comparable to the inactivity of plant life
    type of:
    ease, relaxation, repose, rest
    freedom from activity (work or strain or responsibility)
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