10 causes of insomnia:

Source: National Center on Sleep Disorders Research

- taking daytime naps

- lack of regular exercise

- heavy meals before bedtime

- stress, fear, or exhaustion

- anxiety, depression, or other mental problems

- caffeine, alcohol, or other stimulants before bedtime

- family problems, work-related problems, or relationship problems

- lack of a regular bedtime schedule (not going to bed and not getting up at the same time every day)

- health problems such as infection, trauma, pain, hormonal changes, restless leg syndrome, immune system problems, breathing problems

- changes in your environment or in your sleep habits such as too much light, noise, strong smell, working late, having jet lag, sleeping in a different bed