Imovane belongs to a group of medicines called CNS Depressants or central nervous system depressants. These drugs depress our central nervous system and make us drowsy or less alert. If someone is having difficulty with sleeping or suffering from insomnia, this drug is used. It helps us to sleep quickly and for a longer period. In general, if sleep medicines are used continuously, the patient may not feel the effect of the drug after a long time. So these medicines should be used in shorter periods of time, like one or two days, and usually for no longer than 10 to 12 days.