Life Time

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1. oh_fiddlesticksMay 2026
   If you're interested in poly phasic sleep, the book "Life Time" by Professor (of circadian neuroscience) Russell Foster goes further.
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2. llamasushiJul 2025
   Piggybacking off this, for a more general reason for sleep: "My definition would be as follows: sleep evolved as a species-specific response to a 24-hour world. During sleep – a period of physical inactivity – individuals avoid movement within an environment to which they are poorly adapted, but then use this time to undertake essential housekeeping functions demanded by their physiology."

   From Life Time by Russell Foster. Still one of the most lucid and well-written books on sleep I've ever read.

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3. ides_devJul 2024
   I enjoyed reading Life Time by Russell Foster [1]. Professor Foster is the Head of Oxford’s Nuffield Laboratory of Ophthalmology and the founder and Director of the Sleep and Circadian Research Institute. In it he covers lots of aspects of sleep and ways to try and improve it.

   [1] https://www.goodreads.com/book/show/58417761-life-time

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