Practice Pranayama / Yoga Breathing either early morning or in the evening just before sunset.
Practice Pranayama on empty stomach.If you are practicing pranayama in the evening make sure , you haven’t eaten for at least 3 hours before pranayama. There should not be any strain in any stage of pranayama. you must enjoy peace,joy and happiness.Do not produce any sound while inhaling or exhaling. The room in which you practise Pranayama must be dry and airy. Pranayma can also be practiced out doors as long as its not too cold or too hot. Practice few rounds of pranayama before meditation , this will drive away drowsiness .