Delta Sleep Inducing Peptide (DSIP): Reviewing the Research Half Life: Dead Zone Character Models Showcase. LambdaGeneration Delta Sleep Inducing Peptide an overview ScienceDirect Topics 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 DSIP Sleep Peptide Purity 98% French Peptides Half Life : Delta Particles (Steam), Ch. 2 "Exit to the Surface"