In Tibb (Islamic Medicine), sleep is classified as moistening.
In a recent study by the University of Pennsylvania it was found that, “Children who eat fish at least once a week sleep better and have IQ scores that are 4 points higher, on average, than those who consume fish less frequently or not at all, according to new findings from”
Source
EurekAlert!, the online, global news service operated by AAAS, the science society.