Suggestions on Ear Training

Suggestions on Ear Training which may be helpful (from book Hal Crook - Ready, Aim, Improvise)
- Strive for quality practice versus quantity. Since lengthy ear training sessions can be mentally stressful and confusing for a beginner, start by doing a few ten-minute ear training sessions per day with two or thee minute breaks, and gradually increase to several 15 or 20-minute listening periods with five-minute breaks.
- Build up your familiarity with one or two type of musical structures at a time, e.g., intervals, scales, triads, four-part chords, etc. 
- Continue practicing the same ear training material on a daily basis for a few to several months, or until you feel saturated with the information or lose interest in it; then move on to new material. (You can always return to the old material later.)
- When practicing ear training late in the day or at night, take 15-minute nap to give your mind a rest before beginning the practice session.