Waking up in the middle of the night with drenched bed clothes and fanning the sudden rushes of heat with anything handy are two classic menopausal symptoms.
All the common symptoms are associated with a decrease in oestrogen. They vary hugely in duration, severity and their impact on women.

Source: British Menopause Society
Hot flushes and night sweats (described as vasomotor symptoms), are experienced by 70-80% of women.