Below is the current errata list for this textbook. These errata will be corrected in the next edition.

 

22.09.2020

Page 130 Question No 6.  The answer should be (a).

18.09.2017

Page 99.  STAGES OF SLEEP.  It seems that REM (rapid eye movement) is now classified as a separate stage of sleep.  The HPL book included REM as part of stage 4 sleep.  I have reworded this paragraph putting REM as a separate stage thereby creating five stages of sleep instead of four as indicated in the current version of the book.  However a Google search will show that many publications still indicate only four stages of sleep. 

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