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National Library of Medicine) Subcutaneous (SQ) injections: technique, site selection, and procedure Frontiers in Pharmacology DSIP fusion peptides crossing the blood-brain barrier and efficacy in insomnia models European Neurology (PubMed) Therapeutic effects of delta-sleep-inducing peptide (DSIP) in patients with chronic pain episodes European Neurology (PubMed) DSIP in the treatment of withdrawal syndromes from alcohol and opiates Johns Hopkins Arthritis Center How to give a subcutaneous injection: site rotation and best practices Additional Research and Background These sources provide related context and are not presented as support for a specific statement above

...but what sleep can reveal about the health of the brain

This isn't theoreticalit's demonstrable in substrate availability and downstream signalling

Toxins (Basel) 9:115