About 50% of people will say it's a miracle while the other 50% will say it's useless. Read these papers yourself and find out where you stand. Half Life Era (1998 2001). It was the first era of the fr LambdaGeneration Delta Sleep Inducing Peptide an overview ScienceDirect Topics DSIP (Delta SleepInducing Peptide) is a naturally occurring neuropeptide first isolated in 1974. Its best known for its potential role in regulating sleep, stress, and neuroendocrine function.,