Sleeping metabolic rate

Methodology papers are so important.
Basal Metabolic Rate, is measured at complete rest and without physical work ( basal metabolism . This is the energy required for the activity of internal organs and to maintain body temperature. This contributes some 60-70% of Total Energy Expenditure. It is said that during sleep the overall metabolism approximates to the basal metabolic rate. Ganpule et al ( European Journal of Clinical Nutrition : Inter individual variability in sleeping metabolic rate in Japanese subjects. , [ 2007] vol 61, 1256-1261) show that the sleeping metabolic rate has a smaller prediction error than basal metabolic rate and is a more accurate value.
I wonder what effect the REM ( rapid eye movement phase of sleep has on the measurement?

Martin Eastwood
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