夜半 is read as よわ (yowa) and means midnight.
よわ
yowa
はんつや
wake
はんや
midnight
よ
dinner
やこう
night train
やかん
night
よなか
middle of the night
よあけ
dawn
よぞら
night sky
やがく
night study
よばなし
book of informal essays
やしょく
supper
よみち
street at night