For many years Kleitman's 1939 monograph was the classic reference work on sleep and wakefulness. As discoveries moved apace in the years following World War II, and as the book became scarce, commanding premium prices on the used book counter, a real need for a new and current summary of research on sleep began to be felt. This need was partly filled by the 1962 publication of Oswald's Sleeping and Waking, but that book, in the author's own words, "did not set out to be an exhaustive reference work," and much was left to be desired.
Now, at long last, the second edition of Kleitman's study has finally appeared and is destined to become the classic reference work on sleep and wakefulness, as was the first edition. The bibliography, which also serves as author index, contains 4,337 citations, indicating the monumental scope of the work.
The author devotes the initial