Short-term and long term
A frequent sleep condition is insomnia. If you have insomnia, you may find it difficult to go to sleep, stay asleep, or have a restful night's sleep. This occurs even if you have the time and ideal surroundings for restful sleep. Your regular tasks may be hindered by insomnia, and it may cause you to feel drowsy during the day.
Stress, alterations in your routine, or your environment can all contribute to short-term insomnia. A few days or weeks may pass before it ends. Insomnia that is chronic (long-term) occurs three or more nights per week, lasts more than three months, and cannot be adequately accounted for by another medical condition.