In every single age group beginning at adolescence, women are twice as likely to have insomnia than men are. Work and family stresses, responsibilities, childrearing and hormonal changes are all factors that interfere with sleep. Insomnia can also be a symptom of other problems such as sleep apnoea, anxiety, depression and restless leg syndrome.
Stick to the principles of good sleep hygiene: go to bed and get up at the same time every night and morning; use the bedroom for sleep and sex only (no television); eliminate caffeine; have small frequent meals; exercise early in the day.
Seek help if these measures don't work.