Imperian has hundreds of help files to help you learn more about the game and how to play.
Sleeping in Imperian is optional, and used mostly to help you regain health, if you have no other means to do so. Typing SLEEP will help you accomplish this. There are a number of ways which you may be put to sleep involuntarily, such as the hourglass tattoo, or the toxin opium. Luckily, some clever Druids have discovered that eating the quince fruit will enable you to awake at will while asleep, and eating the violet root will give you insomnia. With insomnia, you will find yourself unable to go to sleep, although generally the things that put you to sleep will remove your insomnia, if you have it. See: HELP AUTOCURING