Insomnia can develop because of an underlying health condition such as depression or sleep apnea. This is called secondary insomnia. Primary insomnia doesn’t have an underlying cause and can therefore be more challenging to treat.
Common triggers for a bout of insomnia include:

  • Stress
  • Pain
  • Medication
  • Depression
  • Anxiety
  • Noise
  • Light
  • Uncomfortable temperature

Your workday schedule or experiencing jet lag can also trigger insomnia.

Brief periods of insomnia, such as a few days at a time, aren’t usually anything to worry about, but if your insomnia endures for several months and occurs frequently, you should seek medical help.