Is this peptide a key to happiness?

Hypocretin, a peptide neurotransmitter increased during positive experiences, could be instrumental in battling depression.

Poor sleep in old age prevents us from storing memories

Memories get "stuck" — and eventually are erased — without deep sleep to move them to permanence.

Using biomarkers to identify, treat schizophrenia

Researchers say lab-based tests may be a boon to both clinicians and researchers.