Insomnia can be either acute or chronic. Acute insomnia, which is a short-term sleeping disorder, is likely to last for 1 night to a few weeks. On the other hand falls the chronic sleeping disorder, which is long-term in nature and can last up to 3 nights a week and can go to as long as 3 months. In order to save time and avoid taking additional efforts, people usually order Ambien online.