My inspiration comes at evenings. When i sit quietly at home. When i take the time to sit and play around just what i want at that time or listening to some records. Then when it comes i can make sometimes three songs in one evening/night. I go on until the basic is finished, also i write it down so i won't forget the other day.
Some good wine can help the proces, also some weed can get me to creativity.
The most important is not to be disturbed. No screaming kids, telephone or just non musical thoughts in your head.

Free your mind and your axe will follow.