I think the best time to study or memorize anything is 5-6 at the morning before starting a day. Usually when I have to memorize anything I wake up at these times take a shower and start studying comapred to my other experiences this time of the day is the most efficient.
Studying early in the morning is the best time to study because our brain is fresh during this time. Our brain absorbs more informations after it has relaxed that's why morning study is the best time.