Tryptophan (the last bit of the name) is an essential amino ... as the sleep-inducing melatonin. Whether or not that results in you feeling incredibly happy or getting a super-deep sleep, however ...

Nine amino acids comprise the Delta Sleep-Inducing Peptide (DSIP ... particularly the very restorative slow-wave sleep (SWS), also called deep sleep or stage 3 sleep. Findings imply that its potential ...