Studies have shown that it should take you between 7 minutes and 15 minutes to sleep once you have got yourself comfortable in bed. You will find it happens quicker if you develop a regular sleep schedule and time for sleep, have a warm bath first, and turn off any smartphones and electronic devices beeping away with artificial light! Darkness is best for restful sleep, although dim light would be better than having bright light upsetting your body clock. Get more information on how long it takes to sleep here.