Delta Sleep Inducing Peptide an overview ScienceDirect Topics Delta Sleep Inducing Peptide [DSIP] 62568 57 4 PDS 4054 Delta sleep'inducing peptide (DSIP): a still unresolved riddle DSIP (Delta SleepInducing Peptide) is a naturally occurring neuropeptide first isolated in 1974. It's best known for its potential role in regulating sleep, stress, and neuroendocrine function. Here's a clear breakdown of Delta Sleep Inducing Peptide for Deep Rest Valeo Health