Good idea's wasted

I have had some good ideas recently but no time to put them into action. Admitedly as usual they come at bad times like when I am driving, one of the best times to think. Thing is I know when I find the time, I won't feel the same about the idea. It won't have the same appeal, like the moment has gone, the feeling that went with it won't be there and in my mind I won't think it'll work so it never happens. Well maybe it will happen but we shall see.