Pre-sleep mental activity, whether it is relaxing or unremittingly strenuous, does not appear to affect total amount of slow wave activity and its discharge during the night.
The proposition that slow wave activity reflects a need for sleep that accumulates at a rate that depends on earlier wakefulness thus remains unsubstantiated, at least in this study.
This is the view of researchers from the University of Groningen in Haren and Groningen, The Netherlands, following an investigation of the effects of two levels of mental activity on subsequent sleep, an area of sleep research that is largely unexplored.
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