DSIP (Delta Sleep-Inducing Peptide) is a synthetic nine-amino-acid research peptide originally identified through experimental studies involving sleep-associated neurophysiology and electroencephalographic (EEG) activity.

Research involving DSIP has examined sleep-wake regulation, delta-wave activity, circadian signaling, neuroendocrine pathways, neurotransmitter-associated mechanisms, and central nervous system signaling. Experimental studies have also explored the relationship between DSIP and physiological processes associated with stress-response and hormonal signaling.

DSIP remains an experimental compound for investigating the complex molecular and neurophysiological mechanisms associated with sleep regulation, circadian biology, and neuroendocrine signaling.