Do spiritual comforts seem to come steadily or arrive in great waves or streaks?

It should be constant; on going since the Holy Spirit lives in us. Remember we shouldn't confuse our emotional state of mind with our eternal salvation. Our emotions are part of the flesh. The flesh works against the spirit and it can also be tricked by many things. It can range from the amount sleep we get, the foods we eat, how people treat us during the day and even by satan.