Most people experience short term insomnia at some time. Insomnia includes having trouble falling asleep, having trouble getting back to sleep, and waking up too early. Insomnia is more common in females, people with a history of depression, and in people older than 60. Temporary insomnia can be caused by:

Hearing a noise
A stressful event like the loss of a job or a death in the family or even catastrophic world events
Certain medications could keep you awake, particularly those that treat colds and allergies, heart disease, high blood pressure, and pain
Bad habits that sabotage our sleep including drinking alcohol and eating too close to bedtime
Short-term insomnia lasts only a few days and is usually not a cause for concern. For example, with jet lag or even seasonal time changes, your internal body clock will readjust itself within several days. Insomnia is considered chronic when it lasts most nights for a few weeks or more. This longer-term condition deserves professional attention. If you are unsure whether you have chronic insomnia, experts suggest looking at it like you would a headache. If it goes on day after day, and nothing you do seems to help, you should see a health care professional, particularly if you cannot find a cause.