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Typical sleep cyclogram of a healthy young person asleep, showing the progress of the plasma cortisol concentration during the night as well as that of the growth hormones (GH). The shaded boxes mark the REM sleep times once again (source according to Born et al. 2000.)

Typical sleep cyclogram of a healthy young person asleep,
showing the progress of the plasma cortisol concentration during the night as well as that of the growth hormones (GH). The shaded boxes mark the REM sleep times once again (source according to Born et al. 2000.)