Sialorrhea: excessive salivation.

SIGN: Scottish Intercollegiate Guidelines Network.

Somnolence: sleepiness.

Specialist palliative care services: pain relief care from a variety of specialist health professionals triggered at certain times in a condition’s trajectory.

Subcutaneously: located or placed just beneath the skin.

Sundowning: a state of disorientation or agitation that sometimes occurs in late afternoon or evening in people with later stage dementia.