Abstract
Comment on David Haig's 'Troubled sleep': Implications for functions of infant sleep
Highlights
Haig’s hypothesis predicts that ‘Maximal nightwaking . . . will . . . overlap with the greatest benefits of contraceptive suckling
Optimal IBIs may differ for mother–infant dyads depending on both attachment status and ecologic context
In environments with high mortality rates parents should pursue an opportunistic reproductive strategy aimed at greater numbers of offspring appearing at shorter IBIs and receiving lower levels of investment resulting in fewer night wakings and greater numbers of avoidant attachment orientations
Summary
Haig’s hypothesis predicts that ‘Maximal nightwaking . . . will . . . overlap with the greatest benefits of contraceptive suckling. In environments with high mortality rates parents should pursue an opportunistic reproductive strategy aimed at greater numbers of offspring appearing at shorter IBIs and receiving lower levels of investment (e.g. reduced nursing) resulting in fewer night wakings and greater numbers of avoidant attachment orientations. Most night wakings emerge from active sleep or REM [4,5,6,7,8,9,10].
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