sit up with
Keep night vigil
To sit up with someone is to stay awake alongside them through the night, typically during illness, death vigil, or crisis.
The phrase implies companionship and care rather than mere wakefulness: She sat up with her mother until the fever broke.
In older usage, sitting up with a body meant keeping watch over the deceased before burial.
comfort
Ease or soothing relief
tending · watching · companionship · presence · caring · attentive · vigil · overnight · sickbed · reassurance
watchful
Carefully attentive, observant
alert · waiting · deathbed · candle · overnight · witness · attendance · observant · wakefulness · nightlong
attentive presence vs absence/neglect
sit up withabandon
Leave behind permanently
leave alone · neglect · desert · forsake · walk away from