清故宸凉勿梦夜冷
[qīng gù chén liáng wù mèng yè lĕng]
'Cool night under clear skies without dreaming of past coolness' combines elements of past ('故') and current situation('现况'), indicating nostalgia about good old days but now feels the chill. This could mean there was a significant change or feeling down while reflecting back in life.