SLEEP DISTURBANCES AMONG PATIENTS WITH BIPOLAR AFFECTIVE DISORDER IN THE CURRENT DEPRESSIVE EPISODE ASSESSED BY THE SLEEP-50 SCALE AT THE NATIONAL INSTITUTE OF MENTAL HEALTH, BACH MAI HOSPITAL. YHCĐ. 2026;67(CĐ5-NCKH). doi:10.52163/yhc.v67iCD5.5021