Hot flashes, sudden sensations of heat accompanied by sweating, are experienced by 75% to 85% of women during menopause. They can last from 30 seconds to five minutes and often disrupt sleep due to the increase in heat and adrenaline. Night sweats, which are hot flashes that occur at night, can further disturb sleep. These frequent awakenings and discomfort can lead to fatigue the next day. In fact, nearly 44% of women with severe hot flashes experience chronic insomnia.